Remove settingslogic and mina, deploying to heroku

- `mina` has been removed since heroku provides deployment
- `settingslogic` has been removed since we can't upload configuration
  files to heroku
- Configuration is now done through environmental variables, which have
  been added to heroku
- Support has been added for using `unicorn` on heroku
- New Relic has been added for alerts and error reporting

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