build custom layer of Dojo to speed up loading of tt-rss (refs #293)

lib/dojo/_firebug/firebug.css

@@ -25,6 +25,7 @@
 	
 	background:#f0f0f0;
 }
+
 .firebug #firebugLog, .firebug #objectLog {
 	overflow: auto;
 	position: absolute;
@@ -171,6 +172,8 @@
 .firebug .propertyName {
 	font-weight: bold;
 }
+
+/*   tabs   */
 #firebugToolbar ul.tabs{
 	margin:0 !important;
 	padding:0;
@@ -205,4 +208,4 @@
 	text-decoration:none;
 	background:transparent url(tab_rgt_over.png) no-repeat right;
 	color:#FFFFFF;
-}
+}