Add BTChip HW.1 Hardware Wallet

Hi 

A pull request to include HW.1 as a new hardware wallet - based on a smartcard platform, HD, P2SH friendly. 

HW.1 has been around for quite some time now (first sighted in San Jose 2013), redesigned quite a bit, and is now commercially available - it has been integrated into GreenAddress, Electrum, and other services to be announced.

Public APIs are available on https://github.com/btchip and the full technical specification is on https://btchip.github.io/btchip-doc/bitcoin-technical.html

Core devs / testers, feel free to request a sample (samples from San Jose 2013 cannot be updated yet, samples from Amsterdam 2014 are updatable on https://firmwareupdate.hardwarewallet.com)