Update jquery.i18n from upstream

Upstream: https://github.com/wikimedia/jquery.i18n
Upstream changes:
* Fixed a potential js error because of wrong logic
* Fixed some JShint errors
* Added license and credits files
* Updated gitignore file
* Fixed uk and ru grammar rules and updating tests
* Source code formatting updates

Change-Id: I43433cc3d9993045160dc85ed9e73370d22794cf

lib/jquery.i18n/jquery.i18n.language.js

@@ -3,7 +3,6 @@
 	'use strict';
 
 	var language = {
-
 		// CLDR plural rules generated using
 		// http://i18ndata.appspot.com/cldr/tags/unconfirmed/supplemental/plurals?action=browse&depth=-1
 		// and compressed
@@ -522,12 +521,35 @@
 		 * @return string Correct form for quantifier in this language
 		 */
 		convertPlural: function ( count, forms ) {
-			var pluralRules, pluralFormIndex;
+			var pluralRules,
+				pluralFormIndex,
+				index,
+				explicitPluralPattern = new RegExp('\\d+=', 'i'),
+				formCount,
+				form;
 
 			if ( !forms || forms.length === 0 ) {
 				return '';
 			}
 
+			// Handle for Explicit 0= & 1= values
+			for ( index = 0; index < forms.length; index++ ) {
+				form = forms[index];
+				if ( explicitPluralPattern.test( form ) ) {
+					formCount = parseInt( form.substring( 0, form.indexOf( '=' ) ), 10 );
+					if ( formCount === count ) {
+						return ( form.substr( form.indexOf( '=' ) + 1 ) );
+					}
+					forms[index] = undefined;
+				}
+			}
+
+			forms = $.map( forms, function ( form ) {
+				if ( form !== undefined ) {
+					return form;
+				}
+			} );
+
 			pluralRules = this.pluralRules[$.i18n().locale];
 
 			if ( !pluralRules ) {
@@ -621,7 +643,7 @@
 		 * @param form {String}
 		 * @return {String}
 		 */
-		convertGrammar: function ( word, form ) {
+		convertGrammar: function ( word, form ) { /*jshint unused: false */
 			return word;
 		},