Added Stripe API Versioning

This commit adds basic versioning support to hs-stripe

Highlights:
 - RecordWildCards extension was added in an attempt to tidy up things. 
 - Put upper bound on http-conduits (http-conduits > 2.0.0 is a breaking change)
 - Defaults Stripe API to the version it was built against ("2011-09-15-d", Need feedback on this one...)

In http-conduits versions 2.0.0 and greater the kind of Request is now * instead of * -> *. Even more impetus for replacing http-conduits w/ io-streams. Which can be done once I get more time.

If imports are switched around that's due to my emacs configurations and the stylish-haskell plugin.

Other than that it was not a fundamental change and cards are working fine for me.