Lazy loading of regions

Also adds landing page feature. But candidate list is hardcoded
for now. Example html file updated.

show method of lcd renamed to render.

Introduced a trigger searchclear
Introduced mw.uls.changeLanguage, setPreviousLanguages
getPreviousLanguages and getBrowserLanguage methods

Region groups re-numbered - from [4, 1, 2, 3] to [1, 2, 3, 4].

Change-Id: Iac1edf628708e6f40e41578df70d40c42f15289a

lib/jquery.uls/examples/index.html

@@ -34,7 +34,8 @@
 					onSelect : function( language ) {
 						var languageName = $.uls.data.autonym( language );
 						$('a#pageLanguage').text( languageName );
-					}
+					},
+					quickList: ['en', 'hi', 'he', 'ml', 'ta','fr'] //FIXME
 				} );
 			} );
 		</script>