Basic language selector

* uses setlang attribute in URL to switch language
* introduced a language filter widget by extending
  jquery.ui.autocomplete
* UI rendering is done by using SkinAfterContent hook

Change-Id: Ifa63a04ba1d060b6db8fba14bb868045cf6b97c3

resources/ext.uls.init.js

@@ -3,12 +3,6 @@
  */
 ( function( $ ) {
 	$( document ).ready( function() {
-		/* Create a trigger somewhere in the page.
-		$trigger = $("<a href='#'>")
-			.addClass( 'uls-trigger' )
-			.text("English"); // FIXME proper trigger text to go here.
-		$('#mw-head').append( $trigger );*/
-		// Bind ULS to the trigger.
-		$('.uls-trigger').uls();
+		$( '.uls-trigger' ).uls();
 	} );
 } )( jQuery );