Updated edx-oauth2-provider to 0.5.1

DOC: Enhance Content Group and Experiment Group Config Sidebar Help

Adding phil_mcgachey@harvard.edu to the AUTHORS list

Add proxy to allow IE9 to make xdomain requests

skip acid block tests [TE-812]

log and ignore invlaid/deleted courses in Enrollment API

Adds an /xdomain_proxy.html endpoint that serves
the proxy file from the xdomain library.  This
allows IE9 users to iframe in the proxy page
to simulate a cross-domain request with cookies.

change education level option label to read "Associate" degree

Remove mocked has_dynamic_children method.

ECOM-1273

Include VAL data in video module export/import

This is required so that an a video module exported by one Open edX
deployment and imported by another will work correctly if it contains an
edx_video_id but does not populate other URL fields.

JIRA: MA-110

block conversion.

Make BulkAssertionTest.bulk_assertions work with any assert* method

Fix string extraction error in underscore files

Pass standard list of xblock mixins to MixedModulestore in tests

Entrance exam gating

The written style ```interpolate(gettext('some text'), {...}, ...)``` will will cause the string inside gettext() not be extracted.
So a separate line is needed for ```gettext``` when gettext function is directly called inside a call to the interpolate function.

added READMEs for top level directories

- added entrance exam check on course info
- staff can by pass gating and added tests
- refined gating logic
- changes after rebasing with Asad's branch
- check ENTRANCE_EXAMS feature is enabled
- updated test to reflect new logic
- catering anonymous user in entrance exam permission
- fixed broken tests
- change after feedback on 16/3
- fix for a broken test
- created new entrance_exams module
- fixed quality error and improved test coverage
- put get_required_content back in milestones helper
- Refactored entrance exams logic
- Refactored tabs logic
- Fixed broken unit test
- changes after feedback from dan-f on 3/27
- removed unnecessary user.is_anonymous check
- Addressed PR feedback
- Addressed commit-specific feedback
- Rework guard clauses
- Add coverage for course info case

Fixed i18n Problem with xBlock Menu

Convert Vertical XModule to pure Vertical XBlock.

mattdrayer/SOL-461: Student dashboard clean-up

Remove timer_expiration_duration (leftover from Pearson proctored exams)

Fix two missing replacements of {studio_name}