Kyle Conroy 732a494ac4 Add update class method to API resources (#426)
* Rename the `Update` operation to `Save`
* Add the `update` class method to all saveable resources
* Add tests for update method
* Add tests for plans, invoice items, and application fees
2016-06-29 14:13:42 -07:00
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2016-04-11 15:20:42 -07:00
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