display identity information on TREZOR

[karelbilek]

• TREZOR should display identity information, ONLY need when pairing account with public key (site should display the identity too, not needed during usual authentication)
• what to display: full bitcoin address? first bits of address hash? (easier to check)

Motivation

• leverage TREZOR secure display
• resistant to "fake public key submitted by Connect" (when SL turns bad, looses control of github or there is another middle man attack)
• trust is only between user and site

(again just copy-pasting @sipak issue from elsewhere, I don't understand it, do what you want with it)