UWSDEV-49 Create access control groups in Admin
UWSDEV-49: Add and delete users to an access group.
UWSDEV-49: Add drop down for existing access groups in user details page.
UWSDEV-49: Add existing access groups to a user on user details page.
Added DatafileAccess model
UWSDEV-49: Remove access groups from a user on user details page.
Merge changes with origin access_control
Added rspec for datafile and datafile_access
Merge branch 'access_control' of github.com:IntersectAustralia/dc21 into access_control
UWSDEV-49: List users of an access group in a table sorted by first name.
Plus tests, and other improvements.
Merge branch 'access_control' of github.com:IntersectAustralia/dc21 into access_control
UWSDEV-49: Add activate/deactivate button on view access group page.
Remove popup dialog in removing an access group from a user's list. Add more tests for access control.
Merge remote-tracking branch 'origin/master' into access_control
Merge branch 'access_control'