Normalize the page contents used to create a PreviewPage. Fixes #1617.

lib/gollum/app.rb

@@ -421,7 +421,7 @@ module Precious
       post '/preview' do
         wiki           = wiki_new
         @name          = params[:page] ? strip_page_name(CGI.unescape(params[:page])) : 'Preview'
-        @page          = wiki.preview_page(@name, params[:content], params[:format])
+        @page          = wiki.preview_page(@name, wiki.normalize(params[:content]), params[:format])
         ['sidebar', 'header', 'footer'].each do |subpage|
           @page.send("set_#{subpage}".to_sym, params[subpage]) if params[subpage]
         end

lib/gollum/public/gollum/javascript/gollum.js.erb

@@ -345,7 +345,8 @@ $(document).ready(function() {
     var formData = new FormData($('#gollum-editor-form').get(0));
     var paths = window.location.pathname.split('/');
     var sectionAnchor = window.location.hash.substr(1);
-    formData.append('page', paths[ paths.length - 1 ] || '')
+    formData.append('page', paths[ paths.length - 1 ] || '');
+
     $.ajax({
       url: routePath('preview'),
       data: formData,