fixed missing space in test page

src/test.html

@@ -352,7 +352,7 @@ relative_path: ../
     </div>
   </div>
 
-  <h3>Button groups<small>should be same height</small></h3>
+  <h3>Button groups <small>should be same height</small></h3>
   <div class="row">
     <div class="span4">
       <div style="border: solid 1px #d3d3d3;">