[WIP] Faraday

@jcwilk Another proof of concept...

I created a Faraday adapter using crystal lake. I'm not sure this is the best strategy for the longterm implementation, but it seems to work.
Oh, I see what you're saying now. I haven't tried it yet but I'm worried that it won't work because Rails (or maybe Rack) throws an error when you initialize multiple Response objects in the same Thread.