[Feature/WIP] Confirm on editing forms (fixes #2881) (#2980)

* Add and start jQuery AreYouSure

* Update SimpleMDE to 1.10.1 for `forceSync` support

* Forgot to remove old version SimpleMDE 1.10.0

* formatting -.-

public/js/gogs.js

@@ -483,6 +483,7 @@ function initWiki() {
         var simplemde = new SimpleMDE({
             autoDownloadFontAwesome: false,
             element: $edit_area[0],
+            forceSync: true,
             previewRender: function (plainText, preview) { // Async method
                 setTimeout(function () {
                     // FIXME: still send render request when return back to edit mode
@@ -1092,4 +1093,8 @@ $(window).load(function () {
                 break;
         }
     }
-});
+});
+
+$(function() {
+	$('form').areYouSure();
+});