Fix paver python prereq paths
Add ADDL_INSTALLED_APPS to studio for parity with lms
Updates to problem location for opaque keys
Remove package_id and remove lower_ stuff from migrator
STUD-1603
added and updated pavelib/quality.py from dglance branch, deprecated rake quality tasks
fix for pylint/pep8 defaults
i18n: Make values that has 'display_name' be displayed localized in editor

Dictionary values like Boolean, or some other value types which has 'display_name' can now be displayed with the localized version.
Added trailing slashes otherwise the course_id regex sometimes eats up get parameters.

LMS-2738
Make SPOC gradebook an API implementation

rather than just hacked in to the instructor_dashboard base file.
Also move the tests from the legacy implementation to the new dash API implementation.
Remove gradebook code from legacy.py (moved to instructor/views/api.py)
Redirect most studio access through draft modulestore
rather than have caller figure out whether to call draft or direct.
Fixes get_children to always find draft children in studio.
STUD-1662
Merge pull request #3868 from edx/sarina/inst-dash-cleanup

Make SPOC gradebook an API feature
Merge pull request #3869 from edx/dhm/bug_get_children

Redirect most studio access through draft modulestore
Merge pull request #3859 from edx/clytwynec/rake2paver-quality-take2

Clytwynec/rake2paver quality take2
copied from LMS aws_migrate settings
Fix gen_cert_report to use CourseKeys.
Merge pull request #3890 from edx/derf/parameterize_cms_migrations

copied from LMS aws_migrate settings
Merge pull request #3889 from edx/diana/fix-gen-cert

Fix gen_cert_report to use CourseKeys.
Updated changelog
Merge pull request #3891 from edx/flowerhack/changelog

Updated changelog