VID-204 New script to upgrade the <youtube> tags in a wiki

They will be upgraded to [[File:...]] wiki tags
VID-204 Forgot code to change youtube tags on edit
VID-204 Fix for fucked up PROXY settings for php curl.
Remove debug code
VID-204 Use global rather than hardcoded 'stats'
VID-204 Fallback to WikiaBot if we can't load the correct user
Merge pull request #863 from Wikia/VideoSprint25-VID-204-YouTubeEmbed

VID-204 New script to upgrade the <youtube> tags in a wiki