Update token params

Comply with API changes 2012-06-18 and 2012-07-09

All tests pass.
Add tags to gitignore
Factor out empty field removal

DRY

All tests pass.
Add Recipients and Transfers support for pay-outs
Bump to version 0.6.0

This version includes support for transfering money to recipient
bank accounts who aren't the Stripe account owner.  This is good.

All 11 tests pass.