Allow courses to set Matlab API key globally, in advanced settings.
Updated payload for new matlab endpoint.
Updated version of event-tracking library to 0.1.0
Update help for welcome, register, and login pages

All now go to getting started, but have different tokens, for further
segmenting later.
Welcome page text edits
Update EASE in edx-platform requirements
Merge pull request #3936 from edx/will/update-ease

Update EASE in edx-platform requirements
Merge pull request #3926 from rocha/update-event-tracking-version

Updated version of event-tracking library to 0.1.0
Merge pull request #3930 from edx/markhoeber/documentation/doc-446

Studio Welcome, Sign Up, and Sign In pages Help and text fixes
Merge pull request #3501 from edx/dcs/matlab-api-key

Allow courses to set Matlab API key globally, in advanced settings.
Describe Python support for multi-line comments

Added more details around Python's support for multi-line translator comments.
Implement a custom editor for the split_module.

STUD-1529
Create stub CSS file.
First cut at validation messaging for split_tests.
Improve validation to support info, warnings and errors
added experiment error styling
item.py unit tests for split_test editing.
item.py tests for split test editing.
Add template for validation messages
Fix up tests.