* New format: {tag}://{org}/{course}/{category}/{name}[@{revision}]
* Updated tests, code
* Added test chapter with : in url_name in toy course
* added test html page with : in url_name
* added a note to docs

- now handling access control via get_module

Sketchy adding of test dbs to the cms test.py config file -- these are required for the Student (shared django app) tests to run

* NOTE: the new order is NOT saved to the server!

* still a few that I haven't tracked down...

Switch from exception logging middleware to a django signal handler, so that we no longer swallow Http404 exceptions and turn them into 500 errors

* update templates and code references
* also a display_name property that defaults to cleaned url_name

* CMS no longer syncs, it just imports when it gets a commit note
  from github

Only import from github when changes are made, rather than exporting. This prevents bugs in the cms from preventing changes via git

* make logging work properly in cms, dev
* fix a comment

* so they get the staff view of problems
* does NOT actually set User.is_staff

* change references and tests
* add staff/non-staff display
* added is_staff to ModuleSystem

* makes collectstatic happy

Re-add __init__.py for contentstore that was accidentally deleted in 05add581

Separate cms and lms auth and env files, and have the LMS that runs with the CMS use the CMS modulestore