Bump to 2.10
Add the ability to specify the API version for requests.
Version bumps.
Move api version setting to stripe package object.
Add id field for cards.
Implement handling of multiple subscriptions on Customer object.
Explicitly call out the API version we're testing against in specs.
Add disupte support to the Charge object.
The test account now supports 139 currencies? o_O
Bring implementation of invoice lines into sync with API.