Certs: pass course name on queue

Stanford had a problem a few times that certificate requests had
different values for the course display name and the course name printed
on the certificate and verification pages because of human error. This
passes the course display name on the queue to the certificate requests,
so that at least one place where the course name is reproduced (the
certificate agent's settings.py) can be eliminated.
Add documentation on public sandboxes
Respond to DB comments
Respond to Alison comments
Modifying the checkbox examples syntax so that it works in studio.edge.edx.org now.
Remove google analytics tracking from iframes used in Drupal course about pages

This fixes two issues:
 - if the course pointed to doesn't exist, GA was added to the iframe twice
 - more importantly, we don't want to count these as separate views anyway--
   we just care about the about page itself.
 - I also added a note about where we would put our segment.io widget if we want it
   later

LMS-2581
Adding my name to the AUTHORS file.
Merge pull request #3485 from edx/sarina/public-sandboxes-doc

Add documentation on public sandboxes
Add admin.py for instructor_task.

This is primarily so that we can manually fail zombie instructor
tasks that are clogging up the queue for a course.
Merge pull request #3554 from itsbenweeks/itsbenweeks/checkbox_doc_example_update

Modifying the checkbox examples syntax so that it works in studio.edge now.
Integrate event-tracking in to the LMS

Support incremental conversion of events from the old API to the new, in order to ensure the new system is working, enrollment events have been modified to make use of the new API.
Create a skeleton of event-tracking developer docs

A first pass at providing details about how to emit events, what to emit etc.
fixes firefox image hidden overflow bug.
puts GA id in quotes
Merge pull request #3523 from mulby/gabe/tracking-shim

Integrate event-tracking in to the LMS
Merge pull request #3558 from mulby/gabe/event-tracking-doc

Create a skeleton of event-tracking developer docs
Merge pull request #3532 from edx/jrbl/certs_pass_course_name_in_dict

Certs: pass course name on queue
Disable draft and edit links during ajax calls
STUD-1485
STUD-1499
Merge pull request #3274 from edx/ormsbee/instructor_task_admin_for_daves_vacation_enjoyment

Add admin.py for instructor_task.
Merge pull request #3560 from edx/adam/disable-links-ajax-2

Disable draft and edit links during ajax calls