Added migration that creates full_name property
on ThirdPartyAccounts
Added migration that ports all youtube third party accounts username to full_name and the real username to username.
username -> full_name
Added full_name field to ThirdPartyAccount
We need to error when an user try to link more the same account to another user, but not when there are teams involved.
Don't break if there's more than one feed for the same url.
Fixed UnicodeDecodeError while testing the description
for videos.
If there's any error while trying to find a video,
we don't blow up
old_description can be None
1999: Fixing Maggie's last concerns

* added search_fields and full_name to TPA admin
interface
* changed username to full_name when removing
a TPA from profile
Merge branch 'x-youtube-username-fix' into prod-test

Conflicts:
	apps/videos/tasks.py