Add support for Trezor-based addresses [$15]

[robby-d]

Once Trezor is available, add the ability to import an address stored on a Trezor hardware wallet.

Can use this library: https://github.com/trezor/trezor.js
Do signing with this: https://github.com/trezor/webwallet/blob/c12d1d6b32022b25aad64912927a62af394616bc/app/scripts/services/TrezorAccount.js#L137
(their lib takes in a bitcoinjslib tx object, but we could modify it for bitcore)

also, I think we need to add a daemon to run trezord server side (will need to enhance build system, much like we do for the armory daemon)

This will give people the ability to have very secure storage addresses, backed by a hardware wallet device (i.e. the privkey will be stored on the trezor and not generated from the entered seed/password on login).

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