Merge pull request #566 from edx/will/devstack-base-box

Set devstack base box to empanada release (RC)
Merge remote-tracking branch 'origin/master' into rc/empanada
Merge remote-tracking branch 'origin' into rc/empanada
Merge pull request #561 from edx/rc/empanada

Rc/empanada
Jasons-MacBook-Pro-4.local -> {{ansible_hostname}}
Merge pull request #729 from edx/jarv/focaccia

Jarv/focaccia
Merge branch 'master' into release
Merge pull request #775 from edx/feanil/release-gugelhupf

Feanil/release gugelhupf
Update to shibboleth role and allow changing the template directory
extra value to format.
Merge pull request #851 from edx/e0d/fix-secure-vars

extra value to format.
adding bastion role and task to setup access to the dbs from it
allowing ansible-provision to do bare installations
adding verbose flag to provision run
local action for cert and key stat before copy
sudo false for stats
adding dependency for the user role so that bastion users are installed
renaming user_info to USER_INFO
add prod-ssh to our example edx config
Stanford README: update ansible commands