Use block type, rather than class names for StudentPreference field storage in LMS
escape single quotes in optioninput (optionresponse) tags
STUD-893
Merge pull request #1985 from edx/cg/sysadmin-enhancements

Several code enhancements to git_add_course
Merge pull request #2079 from edx/brian/track-commands

Define TrackedCommand for use as base class for tracking management commands
Fix theme issues in Sass preprocessing
Merge pull request #2131 from edx/db/fix-theme-name-issues

Fix theme issues in Sass preprocessing
Enable pure XBlocks, but behind a feature flag

[LMS-226]
[LMS-2013]
Added hostname argument to openended_post command.
ORA-286
Merge pull request #2119 from cpennington/xblocks-behind-feature-flag

Enable pure XBlocks, hidden by feature flags
CertificateItems should be updated for all course students.

Not just students that are currently active.  Students may have enrolled with verified certs, paid, gotten
a refund, and un-enrolled from the original course.  This function should now capture that.
Merge pull request #2068 from edx/usman/lms1584-edge-home-page

Fix register button on edge
Save state before unenrolling student from old course.
Add an apostrophe to the Lorem text.
Fix single-quoted translated strings to be double-quoted.
small bugfixes for theming+sass+templates
BLD-518: Fix video volume cookie.
Fix bug about draft verticals reordering.

STUD-714
Merge pull request #2135 from edx/anton/fix-video-volume-cookie

Video: Fix volume cookie.
Merge pull request #2105 from edx/christina/reorder-privates

Fix bug about draft verticals reordering.
CR response