allowed admin to remove skins, if set

src/views/admin/partials/theme_list.tpl

@@ -16,3 +16,10 @@
 	<div class="clear"></div>
 </li>
 <!-- END themes -->
+<li data-type="bootswatch" data-theme="" data-css="">
+	<div class="pull-right">
+		<button class="btn btn-primary pull-right" data-action="use">Revert</button>
+	</div>
+	<h4>No Skin</h4>
+	<p>Remove applied skin and revert back to the base colours</p>
+</li>