The following methods are available directly under the RippleAPI object,
not under schemaValidator:
isValidAddress, isValidSecret, deriveKeypair, deriveAddress
* Add support for all rippled APIs, including subscriptions.
* Add support for arbitrary stream message types.
* Note that rippled APIs take amounts in drops.
* request() will be available in ripple-lib version 1.0.0+
* major types cleanup, more formatted api methods onto new request method
- getPaymentChannel() now uses this.request()
- getSettings() now uses this.request()
- getLedger() now uses this.request()
- transaction types cleaned up a bit, but still some work left to do
