Request: Provide a way to get a Request object before it's sent to #handle_request

[totallymike]

We're using Patron in a project, and we need to add a few custom headers based on the state of, say, query params and certain other headers. Since Patron::Session#request already builds a Patron::Request object that has so much stuff I need (like a canonical form of the query params), I'd love to have access to that object prior to sending it to handle_request.

Would you be open to a PR that provides such a mechanism?

Pretty much what I'd do is yank out the code that exists in Patron::Session#request, put it in a method called, say, #build_request, then call that method in #request. Then I can get the request and pass it on to #handle_request later if I want to.

[toland]

This sounds fine to me.

[julik]

This has been resolved in a PR.