WIP: Basic setup

** WORK IN PROGRESS: Do not merge yet **

Add/update roles that should result in the following if `swag__enabled` is
set:
- learninglocker installed (but not confugured) in
  `$DOCROOT/learninglocker`
- swag module installed (but no host site)

TODO:
- automate LL config (this will require setting up mongodb)
- Create a module that sets up a django site via wsgi+apache (or nginx?)
  and adds swag (and also kalite, edx, etc?)