Add fixes to notes in #182

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

Victor/cms more auth

* 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

CodeResponse for external/queued grading of student code

Victor/cms auth

cleans up home page header design, adds social sharing to header, adds tos, privacy policy, honor code, help and copyright pages, add liks to those pages in footer, finished contact page

adds pressrelease page, breaks about content into seperate pages, imporvoves some visual elements of about and jobs pages

* test_{cms/lms} will run collectstatic first, fasttest_{cms/lms} won't
* also add staticfiles dir to test_root gitignore

* 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