Merge pull request #362 from edx/ihoover/login_enrollment_refactor

refactor login and enrollment test cases to use the mongo modulestore
Set sys.path properly for docs to build.

We used to do it this way, I'm not sure why it was changed.
Our settings files add directories to the path, so we need to
do it here so that names will be importable.
Update CHANGELOG.rst
We don't need to run sphinx on our tests.
static_template_view.models is gone, remove it from docs.
Suggestions from James: mitx is old-school, as is autogeneration.
Merge pull request #363 from edx/ned/fix-noisy-docs

Ned/fix noisy docs
change log levels on the delete course utility. Otherwise they get filtered out in production environments (min set to WARN level)
Merge pull request #357 from edx/bugfix/dcadams/enroll_emails

Fix course url link in enrollment emails.
Merge pull request #350 from edx/fix/adam/less-noise

move setting changes in tests to override_settings
Removed deprecated mixins from _textbooks.scss
Merge pull request #348 from edx/bugfix/ichuang/idasbhoard-track-json

tracking in idashboard should only log json-serializable objects
Merge pull request #364 from edx/fix/cdodge/change-log-level-on-course-delete

change log levels on the delete course utility. Otherwise they get filte...
Merge pull request #347 from edx/update-sass

Update SASS and Bourbon, add Neat
Studio: adds static states for all authorship cases on dashboard (WIP)
Studio: revises static states for all authorship cases on dashboard (WIP)
Studio: resolves blue primary button default + hover color states
Studio: revises static dashboard states for all authorship rights scenarios
copy changes
Studio: revises notice copy to reference UI above, not below