Backport some JS changes from github.com

lib/gollum/frontend/public/javascript/editor/gollum.editor.js

@@ -62,7 +62,7 @@
           // get form fields
           var oldAction = $('#gollum-editor form').attr('action');
           var $form = $($('#gollum-editor form').get(0));
-          $form.attr('action', '/preview');
+          $form.attr('action', this.href || '/preview');
           $form.attr('target', '_blank');
           $form.submit();
 
@@ -154,7 +154,13 @@
     define: function( name, definitionObject ) {
       LanguageDefinition._ACTIVE_LANG = name;
       LanguageDefinition._LOADED_LANGS.push( name );
-      LanguageDefinition._LANG[name] = definitionObject;
+      if ( typeof $.GollumEditor.WikiLanguage == 'object' ) {
+        var definition = {};
+        $.extend(definition, $.GollumEditor.WikiLanguage, definitionObject);
+        LanguageDefinition._LANG[name] = definition;
+      } else {
+        LanguageDefinition._LANG[name] = definitionObject;
+      }
     },
 
     getActiveLanguage: function() {
@@ -808,6 +814,12 @@
 
           // generate help menus
           Help.generateHelpMenuFor( name );
+
+          if ( $('#gollum-editor-help').length &&
+               typeof $('#gollum-editor-help').attr('data-autodisplay') !== 'undefined' &&
+               $('#gollum-editor-help').attr('data-autodisplay') === 'true' ) {
+            Help.show();
+          }
         }
       } else {
         if ( $('#function-help').length ) {
@@ -1006,7 +1018,15 @@
      */
     evtHelpButtonClick: function( e ) {
       e.preventDefault();
-      if ( Help.isShown() ) { Help.hide(); }
+      if ( Help.isShown() ) {
+        // turn off autodisplay if it's on
+        if ( $('#gollum-editor-help').length &&
+             $('#gollum-editor-help').attr('data-autodisplay') !== 'undefined' &&
+             $('#gollum-editor-help').attr('data-autodisplay') === 'true' ) {
+          $.post('/wiki/help?_method=delete');
+          $('#gollum-editor-help').attr('data-autodisplay', '');
+        }
+        Help.hide(); }
       else { Help.show(); }
     },