Merge pull request #5242 from Wikia/CON-1655-dropdown-module

Con 1655 dropdown module
CON-2004 create extension for article navigation
ArticleComments: make it render and load in Venus
CON-2004 move assets to AssetManager group
ArticleComments: add basic styling
CON-1786 | RWA WPI
Merge pull request #5246 from Wikia/CON-2004-add-left-nav-controller

CON-2004 create extension for article navigation
ArticleComments: use different templates for Venus
CON-1786 | RecentWikiActivity i18n
CON-1786 | Recent Wiki Activity vertical alignment
CON-1785: Recommended videos insertion
Merge remote-tracking branch 'origin/CON-NewArticle' into CON-1785

Conflicts:
	extensions/wikia/AssetsManager/configGroups/VenusConfig.php
CON-1785: Remove unused asset
Fix icon name
ArticleComments: pass the current skin to the AJAX request
CON-1786 | Recent Wiki Activity cleanup
ArticleComments: load different CSS for Venus
Merge pull request #5191 from Wikia/CON-1988

CON-1988 fix for loading assets group for skin
CON-1786 | RecentWikiActivity background color change
CON-NewArticle disable toc initialization when haeders are not present on page