Fixes has_changes to search all the way to leaf nodes
skipping update assets, not just collectstatic, in unit tests
Add openedx-analytics discussion group to CONTRIBUTING file
Merge pull request #4299 from edx/clytwynec/skip_update_assets_for_unittests

skipping update assets, not just collectstatic, in unit tests
Merge pull request #4302 from edx/benmcmorran/fix-has-changes

Fixes has_changes to search all the way to leaf nodes
Merge pull request #4306 from edx/db/openedx-analytics

Add openedx-analytics discussion group to CONTRIBUTING file
Replace unit page with the container page.

STUD-1754
New Publishing controls on Unit page.

STUD-1707
cleanup of unit, container, and xblock sass; added modules and layout sass; publishing states and actions on new unit
New publishing controls on unit page (continued)

STUD-1707