* Fix all stylelint errors
For any errors that fixing would require changing the output of the css disable stylelint for that line instead of modifying.
* Update quality.py
Make stylelint quality check pass when there are no errors
* Delete empty selectors
Final official name is Custom Courses for EdX (CCX), rename all code to remove previous name.
Rename the FEATURE constant used to identify this feature
Rename the middleware for the CCX change
rename the constant used for storing the current poc id on the session.
rename the _PocContext threading local
rename the override provider in all places where it is referenced
`PersonalOnlineCoursesOverrideProvider` -> `CustomCoursesForEdxOverrideProvider`
generally rename symbols from overrides.py to replace `poc` with `ccx` where possible without changing model names or attributes
rename more symbols from poc to ccx
rename util functions from app utils module
general symbol renaming poc -> ccx in views.py and related url changes
Rename the coach role wherever it is used.
reword poc_coach to ccx_coach
UI rename
replace POC with CCX globally
template context variable renamed
rename poc_ to ccx_ in urls and all related locations (views, js, scss etc)
remove pocs migrations
Final massive renaming, including models. Re-built migration.
cleaning up a few tailing references
Fix reference typo in schedule template JS
undo modifications made on the fly in test setup to ensure that our tests are properly isolated from the rest of the system tests.
Fixesjazkarta/edx-platform#38
Clean up some leftover strings and comments
fixing more strings and comments in python files
fix a naming error in the schedule tab that was causing problems in deleting courseware items.
Fixesjazkarta/edx-platform#36
updating tests and utility code to match changes in infrastructure from latest rebase
