Remove unused massemail commands.
Clean up of modulestore references (primarly LMS).

STUD-1151
add push_to_lms to Studio; uses MITX_FEATURES['ENABLE_PUSH_TO_LMS']
Push To LMS updates
Added tests
Converted scripts to django commands
Removed advanced module requirement
Generalized to platform
Switched to subprocess for shell commands
Beefed up resiliency and error checking.
Refactored since #1910 removed get_location_and_verify_access
Added settings to aws for export directory and reworked test setup and teardown
Several review based fixes
Added line to Changelog
Changed URL handler to be accepting and moved git bare repo inside of test_root/data
Added exception logging to help trace issues
Added output in exception logging
Made the branch to commit to explicit instead of implicit
Skipping git identity test on condition of global configuration set
Major refactor and rename of feature
All forward facing wording changed to Export to Git
Export to git functions removed from management command and put in common file
Additional error checking and documentation improvements
Nitpicks and other minor fixes
Check for forum data errors in LMS

Some messages generated by the comments service are not readily
translated because they come from third-party libraries. Thus, we plan
to try to avoid showing any comments service generated message to the
user. This check preempts the only end-user-visible CS-generated error
message that we are presently aware of.
Merge pull request #2585 from edx/gprice/lms-forum-error-check

Check for forum data errors in LMS
Removed default background image for home and courses pages
Merge pull request #2566 from edx/giulio/remove-edx-bg-image

Removed default background image for home and courses pages
Merge pull request #2562 from edx/christina/lms-mixed

Clean up of modulestore references (primarily LMS).
Merge pull request #718 from edx/feature/ichuang/push-to-lms

Let a Studio user export course to git (and via git, to elsewhere, eg LMS)
BLD-837: Fix download transcript behavior.
Merge pull request #2587 from edx/anton/fix-download-transcript

Video: Fix download transcript behavior.
Added space between counts on staff grading panel.
ORA-294
Merge pull request #2601 from edx/waheed/ora294-ui-issue-on-staff-grading

Added space between counts on staff grading panel.
Merge pull request #2405 from edx/ned/remove-massemail

Remove unused massemail commands.
Replace rake functions with python paver functions
Deprecated rake functions issue a warning and then call paver
replacements

Bring Paver commands up to date with master for servers, assets, and docs.
Revert deprecation of quality, tests, and i18n for a future pull request.
Deprecate workspace migration
Merge pull request #2520 from edx/will/paver-rebase-part-1

Paver (Part 1)
Add tests of the frontend children api using the AcidXBlock