Add tooltips

Author: Gaurav0

app/gist/template.hbs

@@ -50,7 +50,7 @@
   <div class="col-md-4 output">
     <div class="header">
       {{#if noColumns}}
-        <span class="glyphicon glyphicon-plus" {{action 'addColumn'}}></span>
+        <span class="glyphicon glyphicon-plus" {{action 'addColumn'}} title="Show an editor panel"></span>
       {{/if}}
       {{build-messages notify=notify
                        isBuilding=isBuilding

app/templates/components/file-editor-column.hbs

@@ -24,9 +24,9 @@
   </ul>
 
   <span class="nav-right">
-    <span class="glyphicon glyphicon-remove" {{action 'removeColumn' col}}></span>
+    <span class="glyphicon glyphicon-remove" {{action 'removeColumn' col}} title="Hide this panel"></span>
     {{#if isLastColumn}}
-      <span class="glyphicon glyphicon-plus" {{action 'addColumn'}}></span>
+      <span class="glyphicon glyphicon-plus" {{action 'addColumn'}} title="Show another panel"></span>
     {{/if}}
   </span>
 </div>