Better handling of already linked team youtube accounts

Added code to handle this use case:
  - I'm an admin for Team A and B
  - I link my youtube account to Team A
  - Later, I try to link the same account to Team B

Now the error message also links to Team A's integrations settings
page.  This lets me add team B to the sync teams without too much
work.

Moved the code that generates the error message from models.py to
views.py.
Updated the migration to import accountlinker data

Added code to handle a bunch of corner cases and made a test to check
that we handle them correctly.
Fix the migration based on some errors I saw with real data
Catch all exceptions when syncing

The gdata.youtube module uses exceptions that don't derive from
StandardError (for example RequestError).  So we need to catch them
all.
Merge remote-tracking branch 'origin/staging' into dev

Conflicts:
	apps/externalsites/migrations/0008_import_accountlinker_data.py
Fig/docker update

Fixed bin/dev to properly start a server.  Using fig run doesn't work,
because it doesn't expose the ports.  Changed "resetdb" to "dbreset".
Somehow this sounds better to me.  Made the bash command work with
older fig versions.

Fixed fig.yml to make the ssl-app and worker work correctly.  Changed
the entries for dev stuff so that the entrypoint is /usr/bin/env.  We
basically want to unset the entrypoint and I think this is a good hack
to simulate doing that.  Removed working_dir parts.  We are specifying
the same value is in our Dockerfile and working_dir is not supported
in fig 0.4.2.

Set the LANG env variable.  This prevents an exception in
createsuperuser.
Slight cleanup for the Workflow model

titleEdited was not really doing anything.  We were setting
titleEdited to true anytime we moved to the title stage and we were
only checking it to move past that stage.

showOverlay was also pretty weird.  We would set it to false, then set
it to true, then set it back to false immediately after.  Changed it
so that it starts true, then goes to false in appActionDone().