Upgrade `requests` module to 2.3.0
Upgrade `oauthlib` module to 0.6.3
Merge pull request #1 from edx/master

up to date
add some vars for smtp backend

add some vars for smtp backend
Update AUTHORS
Update AUTHORS
Migrate all enabled service variants databases
allows overriding ssh user
refactoring key handling for redhat variants.
adding dash

need to update the play tag and jenkins
Use DraftMongoModuleStore.

The regular mongo module store is deprecated.
Use draft-preferred to access draft modulestore.
Merge pull request #1330 from edx/feanil/fix_preview

Feanil/fix preview
Merge pull request #1331 from edx/release

Release
Don't install atlas by default.
borwsermob-proxy role added
Merge pull request #1332 from edx/feanil/remove_atlas

Don't install atlas by default.
Reorder xml imports so that migrations run first.
Update permissions and download location of the zip file.
identity.key is no longer a file that jenkins tracks.