Homestyx hydra

R1:cc586b0afa0e

For discussion -- Stripe integration

Summary:
various stripe stuff, including

- external stripe library
- payment form
- test controller to play with payment form, sample business logic

My main questions / discussion topics are...

- is the stripe PHP library too big? (ie should I write something more simple just for phabricator?)
-- if its cool, what is the best way to include the client? (ie should I make it a submodule rather than the flat copy here?)
- is the JS I wrote (too) ridiculous?
Repository: R1 hydra
Commit Date: Apr 4 2012