Added HTTP Strict Transport Security headers to ensure clients always
use SSL (helps prevent MITM attacks).
fixing umask
Merge pull request #826 from edx/jarv/user-refactor

fixing umask
adding symlinks
updating sudoer roles
vagrant version set to minium 1.4
split to remove extensions
Merge pull request #828 from edx/han/Vagrantfile

vagrant version set to minium 1.4
changing sudoer filenam
Add a role that will build an admin jenkins.
adding edxapp python
adding comment
Merge pull request #830 from edx/jarv/automator-updates

Jarv/automator updates
Update from PR Review.

Move overridable defaults to the top of the defaults file.
Remove the handlers stub.
Have seperate collections for the different plays.
Merge pull request #829 from edx/feanil/admin_jenkins

Add a role that will build an admin jenkins.
Add tags to the Abbey AMIs.
Move to where we're already querying for the image.
Enable X11 forwarding in devstack release versions
Merge pull request #831 from edx/zoldak/enable-x11-forwarding-in-release

Enable X11 forwarding in devstack release versions