- now handling access control via get_module

* 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

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

* change custom tags in test/data/full to new single-tag format
* fix broken file references
* fix argument to import_from_xml
* error_handler fix in mongo.py in next commit

Split out code to replace /static urls in get_html into a separate module so that it can be used in CMS previews

Uniquify js fragments pulled from XModules, and load both XModuleDescriptor and XModule js into the cms

Add tests for the edit page for the toy course, and make sure that exporting to github sets up the git repo properly

* use 'location' instead of 'id' in views.
* still need to change names in the coffeescript--quick fix didn't work

* add optional author_str param to export_to_github
* pass the django user info to that param

* add dummy has_access(user, location) method
* re-organize views by type of access checking needed.

* connect up views from student app
* Add initial @login_required decorators on the protected views
* Add tests for some of the basic functionality

* NOTE: successfully running the tests depends on an updated version of
  django-pipeline, which fixes a unicode bug (https://github.com/MITx/django-pipeline/commit/efaba4ac63bc635da6a728603e87e14758541ec7)

Config changes:
* Use separate db for the cms
* Run collectstatic before running tests--needed to get everything in the right place for loading pages
* fix some paths related to this
* Turn off JS compressor for CMS
* add empty test_root/uploads dir

Code changes:
* Add cms tests to check that home page and signup pages load
* Add cms account creation test
* Make github sync tests clean out repo dirs before running.

* Enable account creation
* Some code cleanups
* Fix access to nonexistent fields in the account creation view
* Formatting fixes