API via simple express app

This allows anyone (*) to run minecraft admin commands remotely using an API. It totally needs authentication and should use SSL.

```
In [19]: requests.post("http://dev.tmpnb.org:8080/api/command", params={'command': '/op rgbkrk'}).content
Out[19]: '[10:22:10] [Server thread/INFO]: Opped rgbkrk\n'
```
Alright, I'll do that. Using environment variables though.