on the / route only check the health of a service once
Do not show html exceptions since this is a commandline app
Run litmus_paper under unicorn rather than Thin:

- Fixes issues with timeouts not working properly
- Litmus config file must now be passed as an envrironment variable or
  read from /etc/litmus.conf
- Use HUP rather than USR1 to reload config file to match how
  unicorn reloads the app