Bump up Sass version to 2.1.2

Author: kaelig

ui/_config.scss

@@ -15,7 +15,7 @@
 ///
 /// @type String
 /// @access private
-$app-version: '2.1.0';
+$app-version: '2.1.2';
 
 /// Debug mode (uncomment to activate)
 /// Turn on to output deprecation warnings during development