Log Message:
=== 1.22.1 2015-03-30
* Pass `stripe_account` to Balance.retrieve
=== 1.22.0 2015-03-22
* Added methods for updating and saving arrays of objects
=== 1.21.0 2015-02-19
* Added Bitcoin Receiver update and delete methods
=== 1.20.2 2015-01-21
* Remove support for top-level bitcoin transactions
=== 1.20.1 2015-01-07
* Adding bitcoin receiver and transaction objects
=== 1.20.0 2014-12-23
* Adding support for file uploads resource