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
Bump django 1.4 minor version to 1.4.12 to pick up patches
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
Merge pull request #3564 from edx/adam-fix-GA-quotes

puts GA id in quotes
Make release table by PR, instead of by commit
Merge pull request #3551 from edx/victor/remove-iframe-ga

Remove google analytics tracking from iframes used in Drupal course abou...
When sending bulk email check if course is authorized.
Also the idash_mode property is stored seperately for each course.

LMS-2565
Update IFrame documentation
Merge pull request #3527 from edx/sylvia/docs/DOC-295

Add IFrame template documentation
Parameter from_email to send_mail() should be string and not string in list.

LMS-2518
Major refactoring based on Cale's branch approach
Fixed link to docs.edx.org in readme
Removed unused function