Dependency warning message on requirements files
fix capa optioninput template to honor inline flag
Pass in harvest args to fasttest_acceptance, not the args array
add nltk to sandbox reqs
add CAS authentication via django_cas and mods to external_auth
pep8/pylint violations fixes
consistently use inline=False as default in capa inputtypes
Fix selector.
Fix test.
vagrant: Add flag to ensure install is completed at least once

The provisioning script used to check for the existence of the
`/opt/edx/node_modules` folder to decide if the installation has already
been completed. However, since additional instructions were executed
by the installer afterwards, any installation error (eg. download
timeouts on low quality connections) happening between the creation of
that folder and the end of the installation wouldn't be recovered from
on the next vagrant instance boot.
Add in a staff warning message about duplicates
due to the MixedModuleStore pending release, we need to make enrollment start/end dates editable in Studio
Merge pull request #871 from edx/fix/cdodge/re-enable-enrollment-start-stop

due to the MixedModuleStore pending release, we need to make enrollment ...
Fix nopathtoitem error
Don't show course about page link when we have the marketing site.

STUD-733
Merge pull request #634 from antoviaque/vagrant-provisioning-resume

vagrant: Add flag to ensure install is completed at least once
Merge branch 'release'
Merge pull request #872 from edx/christina/about-page

Don't show course about page link when we have the marketing site.
Merge pull request #845 from edx/bugfix/ichuang/fix-capa-optioninput-for-inline

Fix capa optioninput template to honor inline flag
update mitxmako lookup / fixes FOR-150