This add GRAMMAR support to the mediawiki.jqueryMsg module:
1. make jqueryMsg understand GRAMMAR(case insensitive)
2. mw.language get convertGrammar, can be overridden per language as in
php
3. Introduce resourceloader module ResourceLoaderLanguageDataModule
4. Language.php get a method to filter wgGrammerForms for the current
contentLanguage.
5. Qunit tests
6. This code was originally written in jsgrammar branch of svn and had
reviewed during the last slush time.
Change-Id: I90dd0b2f0cb30fd30539896c292829adc4fc7364
