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.
It not merged in yet. Need to grab the name of the file from @david415 pr. Was originally sshHostnames but now contains more info than that. Will check with dawood then update and submit