Vid 1288

https://wikia-inc.atlassian.net/browse/VID-1288

This forces a small size on the video thumbnails in the category carousels of the video home page.  It also addresses some issues with the new video thumbnail setup that hadn't been fully exposed before.  

Also some minor tweaks to the left menu items - hovering over the selected item will show a default cursor instead of an arrow, and the title attributes were removed because they were unnecessary and kinda annoying. 

@kenkouot @saipetch @garthwebb @jsutterfield