Add the ability to specify the port of requests

I implemented this for myself a little earlier--thought I'd share it with everyone else. My API runs on port 2403, so I was hitting a brick wall while trying to use this library. I noticed that the default request port was hard-coded as port 80, so I quickly added the ability to specify the port for a request. Works like a charm! I've already added the call to setPort() to the readme.