Change video transcripts to use locators instead of locations.

Part of STUD-870
Fix LTI max_score method.
Add min value.
Make has_score to be XField insted of decriptor property.
Fix LTI tests.
Make runone work with more test output.
fix typo in ORA template (ORA-136)
settings.MITX_FEATURES => settings.FEATURES
Fall back on MITX_FEATURES env variable if FEATURES isn't found

For a smoother transition to the new world
Encode header row (LMS-197)
Disable Peer Track Changes
STUD-1008
Merge pull request #1790 from edx/christina/transcripts

Change video transcripts to use locators instead of locations.
Merge pull request #1827 from edx/db/remove-mitx-from-features

settings.MITX_FEATURES => settings.FEATURES
mitx_markdown => edx_markdown
New Updated Studio Documentation

New documentation from rewrite, audit, and integration of some
documentation from edx101.  Intent to release by training on 12/5.
Editorial updates

update to checking student progress, create new course, index, open
response assessment
adding images for ORA
Continued Editorial work

Continued Editorial work
Continued edits

Worked through Andy's list
Merge pull request #1829 from zubair-arbi/zub/bugfix/std1008-disablepeertrackchanges

Disable Peer Track Changes