Using TREZOR as a hardware SSH/GPG agent

See SatoshiLabs' blog posts about this feature:

• TREZOR Firmware 1.3.4 enables SSH login
• TREZOR Firmware 1.3.6 — GPG Signing, SSH Login Updates and Advanced Transaction Features for Segwit

For usage with SSH, see the following instructions.

For usage with GPG, see the following instructions.