[FEEDS] - Added Flickr and Youtube support
Added width to the Facebook default image
This prevents these image from overpowering the content when feeds fail to load.
Also fixed indentation problems
Modified the ajax plugin to send the context with the event
Converted the feeds plugin to use the ajax-fetch plugin
Increased the feeds timeout and add back the callback options
Fixes weird behaviors with loading
Refactored the two feed process methods into one
Tabs: Only pause inited video players
Multimedia: Fixed not being to have more than one YouTube player per page
Optimizied the feeds code for speed and readability
Fixed the test to accomodate the new event driven model
Merge pull request #5649 from LaurentGoderre/pull-5646

[FEEDS] - Added Flickr and Youtube support