Update tests and minor cleanup.
adjusted Studio container publishing status message
As per request #2898, changed the css for annotator tool to affect tinymc only when in annotator-wrapper.

Also removed the outline:none for accessibility requirements and
removed two redundant css files from lms.
Fix split_test xblock so that it can render in Studio

This change addresses STUD-1403 where split_test modules could not render in Studio.
It changes Studio to pass a new parameter 'runtime-type' of 'studio' when rendering
 an xblock. In split_test, this will then cause all of the children to be rendered,
 rather than just the one that matches the conditional.
Do not allow students to pin/unpin forum threads

The wrong permission was being checked for pinning/unpinning, so a
sufficiently clever student could pin and unpin threads.

JIRA: FOR-499
Support unicode in course ids when dumping all courses

Fixes: AN-657
Update data download dash for parity (LMS-1203)
Inst Dash membership widget accepts usernames

In addition to email addresses. LMS-1438
Acceptance tests for beta instructor dash

LMS-1203
Updates and corrections for DOC-169
Merge pull request #2795 from edx/ahodges/documentation/studentdata

Ahodges/documentation/studentdata
Fixes STUD-1434 by including the CodeMirror css mode in
codemirror-compressed.js
Merge pull request #2920 from rocha/make-course-export-related-command-unicode-aware

Support unicode in course ids when dumping all courses
Merge pull request #2929 from edx/dcs/add-cssjs-to-codemirror

Fixes STUD-1434 by including the CodeMirror css mode in codemirror-compressed.js
Merge pull request #2927 from edx/adam/allow_usernames_or_email

make widget accept usernames or emails (LMS-1438)
Merge pull request #2857 from edx/adam/new-data-download

Update data download dash for parity (LMS-1203)
Allow uppercase transcripts srt extension.
Added internal refs to help researchers find the data format files
Merge pull request #2930 from edx/ahodges/documentation/updateindex

Added internal refs to help researchers find the data format files
Minor code cleanup.