BwAuthority can't be run out of the box without manual work

Currently the bwauthority is quite out of date with the current python ecosystem and doesn't play nice in a dev environment.

The submitted patch makes the following updates:

1. Removes the cron setup to a separate script (so running setup.sh doesn't alter your crontab)
2. Changes the shell script to use a modern pip instead of peep (peep is deprecated and hash checking is incorporated into pip as of version 8.0 (https://pypi.python.org/pypi/peep/)
3. Updated dependencies as far as possible (Elixer's last version is 0.7.1 and is only compatible with SQLAlchemy <= 0.7.8, obvious future enhancement to move away from Elixir)
4. Added a convenience script to kill all the spun up processes
5. Updated the ReadMe and the .gitignore to reflect these changes.

Trac:
Username: davidwf