Add JS polyfill for IE compatibility (#1664). (#1667)

lib/gollum/public/assets/.sprockets-manifest-dbbc2cacd995f16622c4822f21313431.json

@@ -1 +1 @@
-{"files":{"app-6e925e38a12a40c4fa9e0400cc874e0f4f97b66fdeb90a144dea527dbb544fbd.js":{"logical_path":"app.js","mtime":"2021-01-03T19:24:22+05:00","size":136032,"digest":"6e925e38a12a40c4fa9e0400cc874e0f4f97b66fdeb90a144dea527dbb544fbd","integrity":"sha256-bpJeOKEqQMT6ngQAzIdOD0+Xtm/euQoUTepSfbtUT70="},"editor-b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08.js":{"logical_path":"editor.js","mtime":"2020-12-30T18:08:26+05:00","size":747276,"digest":"b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08","integrity":"sha256-tiG/4suII1Fvs6lsMuggAbKX9nVBF7R72tblnbhanQg="},"app-4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5.css":{"logical_path":"app.css","mtime":"2021-01-03T19:58:10+05:00","size":298142,"digest":"4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5","integrity":"sha256-QhXlgAKkPEsunw98qgWoHHwJ0iqRjG/kDNjkI9sxELU="},"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css":{"logical_path":"criticmarkup.css","mtime":"2020-12-30T18:08:26+05:00","size":646,"digest":"31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4","integrity":"sha256-Ma5dMoK7uOe3w8mRfp+2jjMVprSnXabOxI0huIRpBcQ="},"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css":{"logical_path":"print.css","mtime":"2020-12-30T18:08:26+05:00","size":75,"digest":"512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb","integrity":"sha256-USSYw2i+DT+xuhBd+oQomuSDgOyfy++Ui9TiOwsJW/s="}},"assets":{"app.js":"app-6e925e38a12a40c4fa9e0400cc874e0f4f97b66fdeb90a144dea527dbb544fbd.js","editor.js":"editor-b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08.js","app.css":"app-4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5.css","criticmarkup.css":"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css","print.css":"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css"}}
+{"files":{"app-08da32a9ae8ccfab60856c64462edecf38ab5e1cb3bf35c8cb60fe021208b9ee.js":{"logical_path":"app.js","mtime":"2021-02-09T10:52:14-08:00","size":136124,"digest":"08da32a9ae8ccfab60856c64462edecf38ab5e1cb3bf35c8cb60fe021208b9ee","integrity":"sha256-CNoyqa6Mz6tghWxkRi7ezzirXhyzvzXIy2D+AhIIue4="},"editor-b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08.js":{"logical_path":"editor.js","mtime":"2021-02-09T09:53:07-08:00","size":747276,"digest":"b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08","integrity":"sha256-tiG/4suII1Fvs6lsMuggAbKX9nVBF7R72tblnbhanQg="},"app-4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5.css":{"logical_path":"app.css","mtime":"2021-02-04T10:41:21-08:00","size":298142,"digest":"4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5","integrity":"sha256-QhXlgAKkPEsunw98qgWoHHwJ0iqRjG/kDNjkI9sxELU="},"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css":{"logical_path":"criticmarkup.css","mtime":"2021-01-06T12:20:04-08:00","size":646,"digest":"31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4","integrity":"sha256-Ma5dMoK7uOe3w8mRfp+2jjMVprSnXabOxI0huIRpBcQ="},"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css":{"logical_path":"print.css","mtime":"2021-01-06T12:20:04-08:00","size":75,"digest":"512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb","integrity":"sha256-USSYw2i+DT+xuhBd+oQomuSDgOyfy++Ui9TiOwsJW/s="}},"assets":{"app.js":"app-08da32a9ae8ccfab60856c64462edecf38ab5e1cb3bf35c8cb60fe021208b9ee.js","editor.js":"editor-b621bfe2cb8823516fb3a96c32e82001b297f6754117b47bdad6e59db85a9d08.js","app.css":"app-4215e58002a43c4b2e9f0f7caa05a81c7c09d22a918c6fe40cd8e423db3110b5.css","criticmarkup.css":"criticmarkup-31ae5d3282bbb8e7b7c3c9917e9fb68e3315a6b4a75da6cec48d21b8846905c4.css","print.css":"print-512498c368be0d3fb1ba105dfa84289ae48380ec9fcbef948bd4e23b0b095bfb.css"}}

lib/gollum/public/gollum/javascript/app.js

@@ -7,3 +7,4 @@
 //= require gollum.placeholder
 //= require editor/sections
 //= require jquery.resize
+//= require polyfills

lib/gollum/public/gollum/javascript/polyfills.js

@@ -0,0 +1,6 @@
+// Polyfill to support Internet Explorer
+if (!Array.prototype.includes) {
+  Array.prototype.includes = function (x) {
+    return 0 <= this.indexOf(x)
+  };
+}