Another draft of LTI documentation, including a table of options
available in the Studio UI

First attempt at writing LTI documentation. Several questions for tech
reviewers.

Added the following under "Grade an Open Response Assessment Problem":

After you've graded enough responses for AI assessments to start, the
number of responses in the Available to grade column decreases rapidly
as the algorithm grades responses and returns them to your students in
just a few seconds. No student data is lost.

Also corrected a few minor formatting problems.

Created "A Brief Introduction to MathJax in Studio" page (as appendix
G) and included a link in "Math Expression Input" topic.

Updated main ORA documentation based on several bugs; added new
student-facing ORA docs

SplitMongo publish method

Refactor textbooks to use locator URLs

Update factory_boy to 2.2.1

STUD-451

The changes from hotfix/2013-12-04 that we want permanently

Static URL double-slash

Let staticfiles determine the footer URLs

Change forum role granted to staff on enrollment

STUD-945

This applies to global staff (is_staff=True), not course staff.
Previously, staff were granted the Moderator role but not the Student
role upon enrolling in a course. If the Moderator role were later
revoked, then the user would have no role and be unable to post in the
forums, which is confusing for the user. edX staff indicated they would
prefer to not automatically receive the Moderator role, so the Student
role is granted instead. Note that staff will still be able to grant
themselves Moderator privileges through the instructor dashboard if
they wish.

JIRA: FOR-338

fix typo in ORA template (ORA-136)

Encode header row (LMS-197)

Added developer-specific settings to devstack

Fix LTI max_score method.

Video Transcripts: Fix clear and download buttons.

modify partial recovery message

Ned/merge lti hotfix

Add recovery command

Update logging.getLogger() calls to use edx instead of mitx

Removed unused rake tasks