Replace Django with TwistedWeb, closes #12

Since AutobahnPython pulls in Twisted anyways, use the TwistedWeb server
to serve the static content instead of depending on Django. This server
can be run under the same reactor as the Autobahn websocket server so the
whole application can now be brought up with a single twistd command:

twistd -y cah.tac

(Use -noy instead for development)

Since that works, BOOM HEADSHOT to Django, which has had its configuration
files removed.
Refactor server configuration

This at least properly factors out server names and port selections.
Ideally, we wouldn't have to read config.yml in caewebsockets.py either,
but I can't wrap my head around how to give CahWampServer access to the
config dictionary from cah.tac.
Renamed stuff to .mustache for pycharm's formatting
set port to 8765 (sorry, I have something else running on 8000)
setup the tac file to serve up index.mustache