Support query string parameters

[tve]

I'm probably dense, but how do you nicely add query string parameters, e.g. to a GET request? Looking at centra there's a .query function on the request object but I don't see that supported in phin. It seems it would be easy to add that?

[XuluWarrior]

It really is as straightforward as passing the query through to centra. #90

After I wasted time implementing my own version ;P