Use MITX_FEATURES to tell if we're in the CMS; this is much cleaner. Also use $.data instead of a hidden div.

PREVIEW_LMS_BASE must now be set (default value does not work for both edge and edx). Make this work locally as well.
https://edx.lighthouseapp.com/projects/102637/tickets/331

This reverts commit e13556b8b6b54b2791fe7bb1ba2ae5cde10114ce. This is because the
JS files need to be loaded in a specific order for the tests to run properly, and
we don't yet have a way to declare that.

Hacking the Python, because our JS dependency management is borked.

Start linting envs files, add task to only pylint errors, and move pylintrc file to the correct location

while looking for it

This allows us to a) compile the coffeescript and sass from xmodules
using the new out-of-band method and b) reload xmodule static content
whenever it changes, which should make devs much happier.

if user course creation is disabled & if staff email given, add link to request course creation by email

caveat: with a bit of hackery.  Need to do better testing once things are live.

Unit drag and drop works correctly now.