-Adressed all comments

-Updated method "course_key_from_string_or_404" to raise message too.
-Wrote tests for "course_key_from_string_or_404" when exception message is given.
-Modified existing methods to use "ddt.data".
-Used Splunk logs to find exectly where we were getting "Invalid Key Error"
-Updated Views where we were getting "Invalid Key Error" in splunk logs.
-Wrote tests for those View End points where we were getting "Invalid Key Error"

MA-1998 Install and configure django_oauth_toolkit to coexist with
existing oauth libraries.

TNL-4160

TNL-4160

- Ensure that only a course import is saved to the draft branch and then
published. A content library has only a single 'library' branch.
- Add a fields parameter to the create_library call so the call has the
correct number of parameters.
- Add tests which import content libraries using different test methods
and with different branch settings.
- Add test which imports a content library and then exports it.
- Use XBlock module version that supports XML-serialized String of None.
- Add re-import of content library and equality comparison to test.
- Allow get_items to be called on LibraryLocators.

This reverts commit acf6c1d6, reversing
changes made to c59db6e5.

Make base.html Mako template safe by default by:
1. Add page-level default of html escaping
2. Fix escaping of all variables in base.html
3. Fix escaping of all dependent underscore templates
Also includes additional best practices for certificates and
textbooks JavaScript/Underscore in order to complete that work.

TNL-3425

We added the ability here to check if a role has a user in with the ability to refresh the role cache before checking.  Since some tests will make inline requests, which in turn put a user into a new role, we have to refresh afterwards otherwise we won't see that new role in place.  Since we don't want to automatically refresh ever, we just added a way to request it, since we know in this test that we're doing something, effectively, out-of-band, which necessitates it.

- Rename escape_json_dumps to dump_js_escaped_json
- Rename escape_js_string to js_escaped_string
- Update js_escaped_string to output empty string for None
- Introduce dump_html_escaped_json
- Move dump_js_escaped_json after the pipe as new best practice
- Introduce additional uses of helpers
- Introduce new djangolib directory and move js_utils

ECOM-2809

Remove gating api import from course xmodule to avoid importing django related code into non-django related code

ECOM-3278

ECOM-3015

This reverts commit 46df4545, reversing
changes made to 039e6cdf.

ECOM-3278

ECOM-3015

added unit tests and fixed JS tests

added bok choy tests

fixed broken botchoy tests

fixed course discovery broken test

removed monkey patch at class level

changes after feedback from matte

ECOM-2440

The Programs authoring app is a Backbone SPA maintained in a separate repository. The app handles its own routing and provides a UI which can be used to create and publish new Programs (e.g, XSeries). ECOM-2598.

removed print statement