CON-1656 add article_js module
CON-1656 add support for user login modal
CON-1656 add support for wikis which doesn't need user to be logged in
Merge remote-tracking branch 'origin/CON-ArticleNav' into CON-1656

Conflicts:
	extensions/wikia/ArticleNavigation/ArticleNavigationController.class.php
CON-1656 CR fixes
Merge remote-tracking branch 'origin/CON-NewArticle' into CON-1656

Conflicts:
	extensions/wikia/ArticleNavigation/ArticleNavigationController.class.php
Merge pull request #5464 from Wikia/CON-1656

Con 1656