Feature/victor/beta testers

Update to the FAQ page

Feature/vik/add staff grading notifications

Feature/vik/add peer grading notifications

Temporary workaround to our bizarre jenkins/numpy issue.  

remaining:
 * support putting multiple names / emails in the big box we now have

* still needs to support uploading a list
* also want to clean up and refactor the code a bit

Remove circular dependencies that connect student.models and django_comm...

* add a days_early_for_beta inherited policy option
* students in the beta_testers_{COURSE} group get to see content that many days early
* Clean up some docstrings related to time formats
* Add basic test

Conflicts:
	common/djangoapps/student/models.py

added problem weight description

Feature/alex/gst mitx

Upgrade to instructor dashboard: enrollment, offline grades, remote gradebook

with the way shiningpanda works but I can't see any reason why.

Bugfixing. Refactoring. Removed readonly check for text edits. Styling of text edits with jQuery UI.

Removed unnecessary comments. Added feature to update element either on "change" or on "slide" event.

Fixed bug: jQuery slider default change event name is "slidechange", and it behaves a bit differently than "slide" event.