Add future support for GUICallback.
Add Ping implementation.
Replace setFieldByName with object methods.
Add PinMatrixRequest and PassphraseRequest support, just needs GUI and Unicode.
Add GetPublicKey support, yay!  Needs mathematician, the output is greek to me.
   Question about xpubkey, how to get Trezor to return one?
Implement originial interface, tested with 8112ab8.
Merge pull request #5 from cheako/master

Questions about GetPublicKey and Xpub.