add test for textarea at .span12, really fix docs footer

docs/assets/css/docs.css

@@ -912,6 +912,12 @@ form.bs-docs-example {
   }
 
   /* Unfloat the back to top link in footer */
+  .footer {
+    margin-left: -20px;
+    margin-right: -20px;
+    padding-left: 20px;
+    padding-right: 20px;
+  }
   .footer p {
     margin-bottom: 9px;
   }

less/tests/css-tests.html

@@ -1098,6 +1098,18 @@
 
 
 
+<br>
+<br>
+<br>
+
+
+      <div class="row-fluid">
+        <div class="span12">
+          <textarea class="span12"></textarea>
+        </div>
+      </div>
+
+
     </div><!-- /container -->