* 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

* don't know what the intended fix is

Allow module html to link to global static files as well as course static files

Fixed the errors that were breaking tests from unused simplewiki files and a half-migrated certificates module.

Only munge /static/ urls in module html to point to course static files if they don't exist in the global static locations

The path user by url is based on the output css file, which ends up in static/sass, so only use ../, rather than ../../, to reference images

Don't crash the system if you can't parse an xml file while loading a definition for a module descriptor

updating activation mail, adding Gemfile.lock to gitignore

Multicourse wiki

Utf8 migration merge

CMS import backwards compatibility

 - edx4edx and 8.01x course repo errors fixed and verified
 - moving forward, it would be nice if the LMS+CMS xml import failed more gracefully when encountering errors in the xml files, when in debug or authoring mode.  For example, an inadvertent xml error in one problem (eg created by a mistake in an import tool used in the CMS) should not bring down the whole LMS. Ditto if one problem gets deleted from the mongodb or filesystem.

Allow importing of courses that don't have the expected path/filename structure for problems and html

This cleans up remaining issues w/ https://github.com/MITx/mitx/pull/155