Add notification app base

customize.dist/src/less2/include/colortheme.less

@@ -135,6 +135,10 @@
 @colortheme_admin-color: #FFF;
 @colortheme_admin-warn: #ffae00;
 
+@colortheme_notifications-bg: #7c0404;
+@colortheme_notifications-color: #FFF;
+@colortheme_notifications-warn: #ffae00;
+
 // Sidebar layout (profile / settings)
 @colortheme_sidebar-active: #fff;
 @colortheme_sidebar-left-bg: #eee;