Add option for Postgres port

I have Postgres running on a different port than the default.  This adds an option to supply the port.

![screen shot 2013-10-25 at 12 57 06 pm](https://f.cloud.github.com/assets/25/1411008/c3678b86-3daf-11e3-8f35-d9a1bf4745c7.png)