temporary fix for xblock settings scroll
UX-623
make GA account code configurable as well as allow GA to appear on courseware. Also, make the GA account ID configurable rather than hard coded in the Mako template

Conflicts:
	lms/envs/aws.py
	lms/envs/common.py
Enforce type of the XBlocks Fields when set

This updates the XBlock dependency to edX/XBlock@cba8d788f0c16802b4cc468ccb6dc765b62e55e8
and add the newly introduced enforce_type methods
api-v1: Initial API implementation & group relationships

Includes:
* Initial API implementation
* API_KEY header fix
* Fixed indentation error
* move api from common to lms
* Course-Group Relationships
* wip
* add parsing of overview content blob
* initial implementation
* get course updates API method
* get course static tabs API methods
* add unit tests
* fix some merge conflicts and remove some extra print statements picked up in rebase
* better constrain some of the course url regexs to expect a triple for courseId
* add ability to enroll users into courses
* wip
* add queryable group lists
* add a GET endpoint to /api/groups/{groupid}/courses to get the list of courses associated with the group (program)
* return the display names when listing all courses in a group (program)
* create optimized course tree query API endpoint
* make sure group profile data is properly serialized and deserialized. There appears to be a difference between how the Django test client handles things. Disabling unit test for now to unblock UI devs
* null guard
* fix broken unit test
* add GET endpoint to group/user relationships
* Added Security to session api as requested in #785
* Storing passoword history of user and validation for user's email and username
* Moved security tests to lms also
* add two FEATURE flag overrides to enable the security features
* remove unnecessary settings overrides (because they are 'feature flags')
* Adding ratelimiting on login api
* Migrated from Function-Based Views to Class-Based-Views
* Create new Account/Login Audit Log
* The API should provide for an audit log when a user creates a new account or logs into the system.
* UserList.post() now creates UserProfile, UserPreference records
* Group Profile fix
* Filter group subgroups by group type
* Application reorganization
* Name is now required during group creation
* Added null check for profile name
* User must reset password functionality added
* User must reset password dunctionality added
* Added user password reset functionality
* Add password reset api and implemented Password history
* Remove unused imports, password reset message text
xblock-external-ui: Add XBlock API call to render XBlock views

Included commits:
* xblock-external-ui: Include CSRF token in the API answer
* xblock-external-ui: Adds support for CORS headers (cross-domain request)
* xblock-external-ui: Include full path when building local_url
* xblock-external-ui: Fix TestHandleXBlockCallback & bok_choy, add tests
* xblock-external-ui: Only return `instance` in `_invoke_xblock_handler()`
* xblock-external-ui: Group resources by hash tag to avoid duplicate loads
* xblock-external-ui: Alternate referer check for CORS requests
xblock-requirements: Adds mentoring, image explorer, dragndrop, ooyala