Buildout has been removed entirely, all dev installation is now
done via the single tools/install_venv.py script.
Django's manage.py script has also been updated to a newer
version/convention; this allows for less python path mangling
and makes things cleaner and more explicit. Note that, as such,
it has been moved up a directory level.
Change-Id: I62f9f06ee00568fc91e5ba7e1fd15d22ea849d1f