Add XML export and import API functions

These will be used to support export/import of courses containing video
modules that rely on VAL being populated. This does not allow updating
a video (including adding encodings) via import.

JIRA: MA-110

Added missing test case for copy_course

Remove Profile fields other than name

None of the fields except profile_name is ever used at present (we don't
even do any validation that the encoded videos added to VAL match the
profile), and the edX media team prefers that the profiles be somewhat
fungible anyway. The motivation for this change is to avoid the need to
sync profile information between systems when doing export/import of
video modules that use Video IDs.

JIRA: MA-110

Clee/ma 77 auto course reruns

get_video_info_for_course_and_profile only returned one profile.
This has been changed to get_video_info_for_course_and_profiles
where it now takes a list of profiles and then returns the profiles
found.

Takes the videos of an old course id and then adds the new course
id to those videos.

Update .travis.yml

Upgrade South to 1.0.1.

Add sorting parameters to get_videos_for_ids

fixed get_url_for_profile

Support for studio-based Video Pipeline.

-Organized tests for consistency and to increase coverage.
 Added more tests for get_video_for_ids, get_url_for_profile(s),
 and having a colon in edx_video_id.
-Deleted unused test_models.py
-Updated outdated readme note
-Added missing documentation for some functions
-Removed colon

Allow "colon" in edx-video_ids.
Added get_videos_for_ids method.
Added status and created fields.

pylinted known lint

Fixed youtube id lookup (no longer storing youtube urls in db)

Lookup youtube videos by id

Make the admin more usable.

Authorization changes to tighten permissions and use OAuth2.

1. Explicitly added OAuth2 and Session as the authentication types
allowed. Django Rest Framework allows the use of defaults via
settings, but this may have unwanted side-effects since there are
others using DRF with different APIs that have different requirements.

2. Created a ReadRestrictedDjangoModelPermissions class that is a
subclass of DjangoModelPermissions. DjangoModelPermissions only cares
about edit/update/delete permissions and makes everything world
readable by default, which is not desirable for this API.

3. Added the DRF login URLs for running this project locally.

4. Add edX fork of django-oauth2-provider to requirements.