Cleanup of app.py and fabfile

This cleans up some of the unused code in app.py and fabfile, and moves
the old version of app.py to test_app.py, which should be refactored to
contain some of the tornado request handlers that we had in that file
for testing purposes. As well, the experimental fabfile function that
was being used to remotely start the tornado server has been removed.
This will likely be replaced with a call to a process manager that will
start the server once one is installed. Perhaps supervisor.