Added 'add' button on row editor panel list

src/app/partials/roweditor.html

@@ -22,7 +22,7 @@
   </div>
   <div class="row-fluid" ng-show="editor.index == 1">
     <div class="span12">
-      <h4>Panels</h4>
+      <h4>Panels <i class="icon-plus-sign link" bs-tooltip="'Add panel'" ng-click="editor.index = 2"></i></h4>
       <table class="table table-condensed table-striped">
         <thead>
           <th>Title</th>