adding test for stacking text on top of icons

src/_includes/tests/stacked-with-text.html

@@ -0,0 +1,4 @@
+<span class="fa-stack">
+  <i class="fa fa-calendar-o fa-stack-2x"></i>
+  <span class="fa-stack-1x padding-top-sm">27</span>
+</span>

src/_includes/tests/stacked.html

@@ -55,4 +55,4 @@
     <i class="fa fa-github fa-stack-1x"></i>
   </span>
   GitHub Icon
-</p>
+</p>

src/test.html

@@ -729,6 +729,10 @@ relative_path: ../
   <div class="well">
     {% include tests/stacked-inside-anchor.html %}
   </div>
+  <h4>Stacked icon background with text foreground</h4>
+  <div class="well">
+    {% include tests/stacked-with-text.html %}
+  </div>
 
 
   <h3>Mirrored and rotated icons</h3>