Add local settings to fabric and guni.sh

Make will create the `fab_local.py`:
![screenshot 2014-09-21 10 25 01](https://cloud.githubusercontent.com/assets/476364/4347825/2c2f787a-416c-11e4-9f43-ec569f007c9c.png)

and  `USER`, `GROUP` and `PORT` must be set in `.environment`. `NUM_WORKERS` can be overridden by setting it in that file.