diff --git a/package-lock.json b/package-lock.json
index 9c124c4..e4ca6d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1017,6 +1017,15 @@
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+      "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=",
+      "dev": true,
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@@ -1100,6 +1109,12 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
+      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
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@@ -1372,6 +1387,29 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.3.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "camelcase": "^4.0.0",
+        "chalk": "^2.0.1",
+        "cli-boxes": "^1.0.0",
+        "string-width": "^2.0.0",
+        "term-size": "^1.2.0",
+        "widest-line": "^2.0.0"
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+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
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@@ -1599,6 +1637,22 @@
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       "dev": true
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+    "camelcase": {
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+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
+      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+      "dev": true
+    },
+    "camelcase-keys": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
+      "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
+      "dev": true,
+      "requires": {
+        "camelcase": "^2.0.0",
+        "map-obj": "^1.0.0"
+      }
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@@ -1630,6 +1684,12 @@
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       "dev": true
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+    "capture-stack-trace": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz",
+      "integrity": "sha512-mYQLZnx5Qt1JgB1WEiMCf2647plpGeQ2NMR/5L0HNZzGQo4fuSPnK+wjfPnKZV0aiJDgzmWqqkV/g7JD+DW0qw==",
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@@ -1672,6 +1732,12 @@
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+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.6.0.tgz",
+      "integrity": "sha512-vsGdkwSCDpWmP80ncATX7iea5DWQemg1UgCW5J8tqjU3lYw4FBYuj89J0CTVomA7BEfvSZd84GmHko+MxFQU2A==",
+      "dev": true
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@@ -1705,6 +1771,12 @@
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+      "resolved": "https://registry.npmjs.org/cli-boxes/-/cli-boxes-1.0.0.tgz",
+      "integrity": "sha1-T6kXw+WclKAEzWH47lCdplFocUM=",
+      "dev": true
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@@ -1841,6 +1913,20 @@
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+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/configstore/-/configstore-3.1.2.tgz",
+      "integrity": "sha512-vtv5HtGjcYUgFrXc6Kx747B83MRRVS5R1VTEQoXvuP+kMI+if6uywV0nDGoiydJRy4yk7h9od5Og0kxx4zUXmw==",
+      "dev": true,
+      "requires": {
+        "dot-prop": "^4.1.0",
+        "graceful-fs": "^4.1.2",
+        "make-dir": "^1.0.0",
+        "unique-string": "^1.0.0",
+        "write-file-atomic": "^2.0.0",
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@@ -1921,6 +2007,15 @@
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+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/create-error-class/-/create-error-class-3.0.2.tgz",
+      "integrity": "sha1-Br56vvlHo/FKMP1hBnHUAbyot7Y=",
+      "dev": true,
+      "requires": {
+        "capture-stack-trace": "^1.0.0"
+      }
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       "resolved": "https://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
@@ -1980,6 +2075,12 @@
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+    "crypto-random-string": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/crypto-random-string/-/crypto-random-string-1.0.0.tgz",
+      "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
+      "dev": true
+    },
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@@ -2250,6 +2351,15 @@
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       }
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+    "currently-unhandled": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
+      "integrity": "sha1-mI3zP+qxke95mmE2nddsF635V+o=",
+      "dev": true,
+      "requires": {
+        "array-find-index": "^1.0.1"
+      }
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       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -2314,12 +2424,24 @@
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true
+    },
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       "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
       "dev": true
     },
+    "deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
+      "dev": true
+    },
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@@ -2443,6 +2565,15 @@
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+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/dom-urls/-/dom-urls-1.1.0.tgz",
+      "integrity": "sha1-AB3fgWKM0ecGElxxdvU8zsVdkY4=",
+      "dev": true,
+      "requires": {
+        "urijs": "^1.16.1"
+      }
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@@ -2513,6 +2644,12 @@
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+    "duplexer3": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",
+      "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
+      "dev": true
+    },
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@@ -2619,6 +2756,12 @@
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+    "es6-promise": {
+      "version": "4.2.6",
+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.6.tgz",
+      "integrity": "sha512-aRVgGdnmW2OiySVPUC9e6m+plolMAJKjZnQlCwNSuK5yQ0JN61DZSO1X1Ufd1foqWRAlig0rhduTCHe7sVtK5Q==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -2991,6 +3134,34 @@
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+    "execa": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",
+      "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^5.0.1",
+        "get-stream": "^3.0.0",
+        "is-stream": "^1.1.0",
+        "npm-run-path": "^2.0.0",
+        "p-finally": "^1.0.0",
+        "signal-exit": "^3.0.0",
+        "strip-eof": "^1.0.0"
+      },
+      "dependencies": {
+        "cross-spawn": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
+          "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^4.0.1",
+            "shebang-command": "^1.2.0",
+            "which": "^1.2.9"
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@@ -3369,7 +3540,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3390,12 +3562,14 @@
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           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.11",
           "bundled": true,
           "dev": true,
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             "balanced-match": "^1.0.0",
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@@ -3410,17 +3584,20 @@
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           "version": "1.1.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
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           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3537,7 +3714,8 @@
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           "version": "2.0.3",
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3549,6 +3727,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -3563,6 +3742,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -3570,12 +3750,14 @@
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           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.3.5",
           "bundled": true,
           "dev": true,
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@@ -3594,6 +3776,7 @@
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           "dev": true,
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           "requires": {
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@@ -3674,7 +3857,8 @@
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           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -3686,6 +3870,7 @@
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           "bundled": true,
           "dev": true,
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@@ -3771,7 +3956,8 @@
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           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3807,6 +3993,7 @@
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           "bundled": true,
           "dev": true,
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@@ -3826,6 +4013,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -3869,12 +4057,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3909,6 +4099,18 @@
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       "dev": true
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+    "get-stdin": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-4.0.1.tgz",
+      "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4=",
+      "dev": true
+    },
+    "get-stream": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+      "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ=",
+      "dev": true
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@@ -3970,12 +4172,40 @@
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       "dev": true
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+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/global-dirs/-/global-dirs-0.1.1.tgz",
+      "integrity": "sha1-sxnA3UYH81PzvpzKTHL8FIxJ9EU=",
+      "dev": true,
+      "requires": {
+        "ini": "^1.3.4"
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       "dev": true
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+    "got": {
+      "version": "6.7.1",
+      "resolved": "https://registry.npmjs.org/got/-/got-6.7.1.tgz",
+      "integrity": "sha1-JAzQV4WpoY5WHcG0S0HHY+8ejbA=",
+      "dev": true,
+      "requires": {
+        "create-error-class": "^3.0.0",
+        "duplexer3": "^0.1.4",
+        "get-stream": "^3.0.0",
+        "is-redirect": "^1.0.0",
+        "is-retry-allowed": "^1.0.0",
+        "is-stream": "^1.0.0",
+        "lowercase-keys": "^1.0.0",
+        "safe-buffer": "^5.0.1",
+        "timed-out": "^4.0.0",
+        "unzip-response": "^2.0.1",
+        "url-parse-lax": "^1.0.0"
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@@ -4271,12 +4501,27 @@
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+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/import-lazy/-/import-lazy-2.1.0.tgz",
+      "integrity": "sha1-BWmOPUXIjo1+nZLLBYTnfwlvPkM=",
+      "dev": true
+    },
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       "integrity": "sha1-khi5srkoojixPcT7a21XbyMUU+o=",
       "dev": true
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+    "indent-string": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/indent-string/-/indent-string-2.1.0.tgz",
+      "integrity": "sha1-ji1INIdCEhtKghi3oTfppSBJ3IA=",
+      "dev": true,
+      "requires": {
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       "dev": true
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+    "is-ci": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-1.2.1.tgz",
+      "integrity": "sha512-s6tfsaQaQi3JNciBH6shVqEDvhGut0SUXr31ag8Pd8BBbVVlcGfWhpPmEOoM6RJ5TFhbypvf5yyRw/VXW1IiWg==",
+      "dev": true,
+      "requires": {
+        "ci-info": "^1.5.0"
+      }
+    },
     "is-color-stop": {
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@@ -4488,6 +4742,15 @@
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       "dev": true
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     "read-pkg": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
@@ -6564,6 +7151,16 @@
         "readable-stream": "^2.0.2"
       }
     },
+    "redent": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/redent/-/redent-1.0.0.tgz",
+      "integrity": "sha1-z5Fqsf1fHxbfsggi3W7H9zDCr94=",
+      "dev": true,
+      "requires": {
+        "indent-string": "^2.1.0",
+        "strip-indent": "^1.0.1"
+      }
+    },
     "regenerate": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.0.tgz",
@@ -6652,6 +7249,25 @@
         }
       }
     },
+    "registry-auth-token": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/registry-auth-token/-/registry-auth-token-3.3.2.tgz",
+      "integrity": "sha512-JL39c60XlzCVgNrO+qq68FoNb56w/m7JYvGR2jT5iR1xBrUA3Mfx5Twk5rqTThPmQKMWydGmq8oFtDlxfrmxnQ==",
+      "dev": true,
+      "requires": {
+        "rc": "^1.1.6",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "registry-url": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/registry-url/-/registry-url-3.1.0.tgz",
+      "integrity": "sha1-PU74cPc93h138M+aOBQyRE4XSUI=",
+      "dev": true,
+      "requires": {
+        "rc": "^1.0.1"
+      }
+    },
     "regjsgen": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/regjsgen/-/regjsgen-0.2.0.tgz",
@@ -6690,6 +7306,15 @@
       "integrity": "sha1-jcrkcOHIirwtYA//Sndihtp15jc=",
       "dev": true
     },
+    "repeating": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/repeating/-/repeating-2.0.1.tgz",
+      "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
+      "dev": true,
+      "requires": {
+        "is-finite": "^1.0.0"
+      }
+    },
     "request": {
       "version": "2.88.0",
       "resolved": "https://registry.npmjs.org/request/-/request-2.88.0.tgz",
@@ -6884,6 +7509,15 @@
       "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
       "dev": true
     },
+    "semver-diff": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/semver-diff/-/semver-diff-2.1.0.tgz",
+      "integrity": "sha1-S7uEN8jTfksM8aaP1ybsbWRdbTY=",
+      "dev": true,
+      "requires": {
+        "semver": "^5.0.3"
+      }
+    },
     "send": {
       "version": "0.16.2",
       "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
@@ -6944,6 +7578,12 @@
         "send": "0.16.2"
       }
     },
+    "serviceworker-cache-polyfill": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/serviceworker-cache-polyfill/-/serviceworker-cache-polyfill-4.0.0.tgz",
+      "integrity": "sha1-3hnuc77yGrPAdAo3sz22JGS6ves=",
+      "dev": true
+    },
     "set-value": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
@@ -7438,6 +8078,21 @@
       "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
       "dev": true
     },
+    "strip-eof": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
+      "dev": true
+    },
+    "strip-indent": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
+      "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
+      "dev": true,
+      "requires": {
+        "get-stdin": "^4.0.1"
+      }
+    },
     "strip-json-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
@@ -7509,6 +8164,34 @@
         "util.promisify": "~1.0.0"
       }
     },
+    "sw-precache": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/sw-precache/-/sw-precache-5.2.1.tgz",
+      "integrity": "sha512-8FAy+BP/FXE+ILfiVTt+GQJ6UEf4CVHD9OfhzH0JX+3zoy2uFk7Vn9EfXASOtVmmIVbL3jE/W8Z66VgPSZcMhw==",
+      "dev": true,
+      "requires": {
+        "dom-urls": "^1.1.0",
+        "es6-promise": "^4.0.5",
+        "glob": "^7.1.1",
+        "lodash.defaults": "^4.2.0",
+        "lodash.template": "^4.4.0",
+        "meow": "^3.7.0",
+        "mkdirp": "^0.5.1",
+        "pretty-bytes": "^4.0.2",
+        "sw-toolbox": "^3.4.0",
+        "update-notifier": "^2.3.0"
+      }
+    },
+    "sw-toolbox": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/sw-toolbox/-/sw-toolbox-3.6.0.tgz",
+      "integrity": "sha1-Jt8dHHA0hljk3qKIQxkUm3sxg7U=",
+      "dev": true,
+      "requires": {
+        "path-to-regexp": "^1.0.1",
+        "serviceworker-cache-polyfill": "^4.0.0"
+      }
+    },
     "symbol-tree": {
       "version": "3.2.2",
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.2.tgz",
@@ -7555,6 +8238,15 @@
         }
       }
     },
+    "term-size": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/term-size/-/term-size-1.2.0.tgz",
+      "integrity": "sha1-RYuDiH8oj8Vtb/+/rSYuJmOO+mk=",
+      "dev": true,
+      "requires": {
+        "execa": "^0.7.0"
+      }
+    },
     "terser": {
       "version": "3.17.0",
       "resolved": "https://registry.npmjs.org/terser/-/terser-3.17.0.tgz",
@@ -7596,6 +8288,12 @@
         "xtend": "~4.0.1"
       }
     },
+    "timed-out": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/timed-out/-/timed-out-4.0.1.tgz",
+      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
+      "dev": true
+    },
     "timers-browserify": {
       "version": "2.0.10",
       "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-2.0.10.tgz",
@@ -7699,6 +8397,12 @@
         "punycode": "^2.1.0"
       }
     },
+    "trim-newlines": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
+      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
+      "dev": true
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
@@ -7747,6 +8451,30 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "uglify-es": {
+      "version": "3.3.9",
+      "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.3.9.tgz",
+      "integrity": "sha512-r+MU0rfv4L/0eeW3xZrd16t4NZfK8Ld4SWVglYBb7ez5uXFWHuVRs6xCTrf1yirs9a4j4Y27nn7SRfO6v67XsQ==",
+      "dev": true,
+      "requires": {
+        "commander": "~2.13.0",
+        "source-map": "~0.6.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.13.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz",
+          "integrity": "sha512-MVuS359B+YzaWqjCL/c+22gfryv+mCBPHAv3zyVI2GN8EY6IRP8VwtasXn8jyyhvvq84R4ImN1OKRtcbIasjYA==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "uncss": {
       "version": "0.16.2",
       "resolved": "https://registry.npmjs.org/uncss/-/uncss-0.16.2.tgz",
@@ -7887,6 +8615,15 @@
       "integrity": "sha1-/+3ks2slKQaW5uFl1KWe25mOawI=",
       "dev": true
     },
+    "unique-string": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
+      "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
+      "dev": true,
+      "requires": {
+        "crypto-random-string": "^1.0.0"
+      }
+    },
     "unquote": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/unquote/-/unquote-1.1.1.tgz",
@@ -7933,12 +8670,36 @@
         }
       }
     },
+    "unzip-response": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/unzip-response/-/unzip-response-2.0.1.tgz",
+      "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=",
+      "dev": true
+    },
     "upath": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.2.tgz",
       "integrity": "sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==",
       "dev": true
     },
+    "update-notifier": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-2.5.0.tgz",
+      "integrity": "sha512-gwMdhgJHGuj/+wHJJs9e6PcCszpxR1b236igrOkUofGhqJuG+amlIKwApH1IW1WWl7ovZxsX49lMBWLxSdm5Dw==",
+      "dev": true,
+      "requires": {
+        "boxen": "^1.2.1",
+        "chalk": "^2.0.1",
+        "configstore": "^3.0.0",
+        "import-lazy": "^2.1.0",
+        "is-ci": "^1.0.10",
+        "is-installed-globally": "^0.1.0",
+        "is-npm": "^1.0.0",
+        "latest-version": "^3.0.0",
+        "semver-diff": "^2.0.0",
+        "xdg-basedir": "^3.0.0"
+      }
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -7948,6 +8709,12 @@
         "punycode": "^2.1.0"
       }
     },
+    "urijs": {
+      "version": "1.19.1",
+      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.1.tgz",
+      "integrity": "sha512-xVrGVi94ueCJNrBSTjWqjvtgvl3cyOTThp2zaMaFNGp3F542TR6sM3f2o8RqZl+AwteClSVmoCyt0ka4RjQOQg==",
+      "dev": true
+    },
     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
@@ -7972,6 +8739,21 @@
         }
       }
     },
+    "url-join": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.0.tgz",
+      "integrity": "sha1-TTNA6AfTdzvamZH4MFrNzCpmXSo=",
+      "dev": true
+    },
+    "url-parse-lax": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
+      "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^1.0.1"
+      }
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -8187,6 +8969,15 @@
         "isexe": "^2.0.0"
       }
     },
+    "widest-line": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
+      "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^2.1.1"
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -8208,6 +8999,17 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "ws": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
@@ -8217,6 +9019,12 @@
         "async-limiter": "~1.0.0"
       }
     },
+    "xdg-basedir": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
+      "dev": true
+    },
     "xml-name-validator": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
diff --git a/package.json b/package.json
index df896d8..1e2215e 100644
--- a/package.json
+++ b/package.json
@@ -33,11 +33,15 @@
     "eslint-plugin-vue": "^5.2.2",
     "parcel-bundler": "^1.12.0",
     "parcel-plugin-static-files-copy": "^2.0.0",
+    "parcel-plugin-sw-precache": "^1.0.4",
     "vue-hot-reload-api": "^2.3.3",
     "vue-template-compiler": "^2.6.8"
   },
   "staticFiles": {
     "staticPath": "public",
     "watcherGlob": "**"
+  },
+  "sw-precache": {
+    "maximumFileSizeToCacheInBytes": 10485760
   }
 }
diff --git a/src/main.js b/src/main.js
index 20ecfae..147bb6c 100644
--- a/src/main.js
+++ b/src/main.js
@@ -2,9 +2,13 @@ import Vue from 'vue'
 import App from '/App.vue'
 import store from '/store'
 
+import registerServiceWorker from '/register-service-worker.js'
+
 Vue.config.productionTip = false
 
 new Vue({
   store,
   render: h => h(App)
 }).$mount('#app')
+
+registerServiceWorker()
diff --git a/src/register-service-worker.js b/src/register-service-worker.js
new file mode 100644
index 0000000..a077b4a
--- /dev/null
+++ b/src/register-service-worker.js
@@ -0,0 +1,100 @@
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.1/8 is considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+)
+
+export default function register () {
+  if (process.env.NODE_ENV === ' production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL('/', window.location)
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
+      return
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `/service-worker.js`
+
+      if (isLocalhost) {
+        // This is running on localhost. Lets check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl)
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://goo.gl/SC7cgQ'
+          )
+        })
+      } else {
+        // Is not local host. Just register service worker
+        registerValidSW(swUrl)
+      }
+    })
+  }
+}
+
+function registerValidSW (swUrl) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the old content will have been purged and
+              // the fresh content will have been added to the cache.
+              // It's the perfect time to display a "New content is
+              // available; please refresh." message in your web app.
+              console.log('New content is available; please refresh.')
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.')
+            }
+          }
+        }
+      }
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error)
+    })
+}
+
+function checkValidServiceWorker (swUrl) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl)
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      if (
+        response.status === 404 ||
+        response.headers.get('content-type').indexOf('javascript') === -1
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload()
+          })
+        })
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl)
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      )
+    })
+}