Upgrading gunicorn to latest
Use real templates in forum NewPostView tests
Add cohort selector tests in forum NewPostView
Use some real templates in forum list view tests

Unfortunately, one template (thread-list-template, defined in
_thread_list_template.html) still relies on complex Mako processing, so
that is still being mocked in the tests.
Improve thread list view tests

An obsolete test case was passing because the assertions were too weak,
so the assertions are improved and the test case removed.
Ensure forum nav cohort selector works correctly

One minor case is fixed (to pass "" instead of "all" as the group_id
parameter to indicate viewing all threads), and tests are added.
Move more forum nav rendering logic to front end

The cohort selector is rendered only for a privileged user in a cohorted
course, and that logic is now in an Underscore template instead of Mako.
Remove some uneeded translation strings in git_export
Remove unused analytics JS left over by 3rd party auth changes
Fixes git export to support repositories with dots in their name
Merge pull request #5000 from mitocw/cg/upgrade_gunicorn

Upgrading gunicorn to latest
Added git clean to git export feature
This ensures that additional exports of the content are the
same the first.
XBlock argument passing support
Merge pull request #5108 from edx/pmitros/retrofix-xargs

XBlock argument passing support backport from SDK
show upload progress on import course view + display last import status on import page load
STUD-2017
Strengthened warnings to remember passphrase

@stroilova, @srpearce, please take a look. Fixes DOC-860.
Merge pull request #5102 from edx/ahodges/doc/DOC860

Strengthened warnings to remember passphrase. Fixes DOC-860.
Merge pull request #4560 from edx/zub/story/updatestudioimportstatusui

show upload progress on import course view
CodeMirror should use monospace fonts.

TNL-197
AWS settings for XBlocks to have filesystem-like storage

Upgrades to latest pyfs to support auth not through environment variables