WIP unicorn basics

WIP

Allowing the possibility of `unicorn`.

```bash
$ bundle exec unicorn -c config/unicorn.conf
```

Supports the following ENV configuration variables:

* `UNICORN_WORKERS` - if set, # of workers to run.  Defaults to 1
* `UNICORN_TIMEOUT` - if set, timeout for requests.  Defaults to 60
* `GH_APP` - if set, write out the pid, socket and logs to standard locations