Combine roles

Combined the 3 roles into 1 to make it easier to read/follow

add development task to run `manage.py start` at the end of the app code install. Running `manage.py add_admin` is still a manual process.

Fixed the development and staging tagged tasks to install dev-requirements.txt and tests-requirements.txt. This can be toggled on/off in the vagrant file when testing the appamor profiles.
Correct... that was left over from when we just had one VM defined in vagrantfile with different config files. Will update and submit