Adding go-resftul to benchmarks

Hi Julien, I've added in go-resftul to the suite of benchmarks. go-restful does ok in some respects, but it comes in below average for RAM and speed. I'd say it's somewhat comparable to gorilla-mux, and a little better than Martini.

I hope you find the pull-request in decent shape. I kept to the alphabetical-ish ordering, so goRestful ends up in between goJsonRest and gorillaMux. I ran go fmt on it aswell, so it should all be in order. I haven't updated the readme with results because I figure it'd be best to keep using the same hardware for those figures.

As an aside, my interest in go-restful is that it's self-documenting and supports [swagger](https://helloreverb.com/developers/swagger). I'm deciding on which router to use, and your benchmark was really valuable in that assessment,

My conclusion is that I'm interested in seeing/creating swagger support for httprouter, and then using httprouter. I've already made something ugly to acheive this using go-restful/swagger's code. I'm keen to fork it into something less hackish, but I'd like to see if you have ideas about it first. I'll post my ugly code as a gist and send you an issue on the httprouter project itself.

Cheers, and thanks for all the good work on this stuff.