Code response improvements.

LMS-1492: Convert between webob's cgi.FieldStorage uploaded files to pure file objects.

Restful course settings

Webob represents uploaded files as cgi.FieldStorage objects.  The
XModule code expects pure Python file objects.  Each FieldStorage object
is wrapped to present the proper file interface, with file names.

LMS-1492

One test passes already, the other fails.  Fix in next commit.

STUD-946
STUD-947

Update the calculator hints tooltip with full information.

Fix 500 error in transcripts.

These changes prepare for the changes to the tests that are coming, but
make no change to the behavior themselves.

Fix 0010 courseware migration

Convert tabs to use RESTful API

STUD-850

Allow multiple answers for string response.

Minor cleanup around public RESTful URLs.

Allow colons in Locator fields.

Static CSS and Developer Stack Remnants to .gitignore

Show error on invalid html in course handout edit

a11y - Videos need to alert screenreaders when the video is over.

Updated Change Log.

BLD-488

Disabled Jasmine test due to flakiness on dev machine.
Added test for endTime in update().
Enabled updatePlayTime() tests. Will see on Jenkins.
Adding test for updatePlayTime() method.
Adding ProgressSlider notifyThroughHandleEnd() Jasmine tests.
Fixing Jasmine coverage problems.
Removed cover logs.
Fixing flaky test.
Removed code coverage logs.

BLD-488

Adding focus on slider handle when video ends.
Removing unnecessary debug console.log() calls.
Change back to original code.
Adding comments.
Also undid tabindex=-1 for the slider knob. It is unnecessary, and prevents
the user from tabbing onto the slider.
Adding minor details.
startTime and endTime proper reset.

BLD-488

changes to allow multiple choicetextresponses in one problem

@adampalay will do!

Removed Backbone sourcemap comment

Because the resulting 404 was causing confusion

more granular transactions in grading [LMS-1480]

BLD-524: Add missing assert in video test.

remove field_data_cache from grades.grade and grades.progress_summary

cleans grading code by adding wrappers

STUD-849

Add error recovery and focus trap to thread loading in forum sidebar

Test HTML returned from view methods for "i4X".

STUD-941

Set empty aws credentials to None.

Pull all db (mongo) functions into another file to enable easier replacement