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

UniversalLanguageSelector.i18n.php

@@ -8,11 +8,21 @@
 
 $messages = array();
 
-/** English
+/**
+ * English
  * @author santhosh
-*/
+ */
 $messages['en'] = array(
 	'UniversalLanguageSelector' => 'Universal Language Selector',
-	'uls-desc'    => 'Universal Language Selector',
-	'uls-select-content-language'    => 'Select Content Language',
+	'uls-desc' => 'Universal Language Selector',
+	'uls-select-content-language' => 'Select language',
 );
+/**
+ * Message documentation
+ *  @author santhosh
+ */
+$messages['qqq'] = array(
+	'UniversalLanguageSelector' => 'Extension name',
+	'uls-desc' => 'Extension description',
+	'uls-select-content-language' => 'Main heading in the language selector popup.',
+);