Integrate directly with Keybase

I'd like to see this integrated directly with keybase. Right now, I have to:

1. Follow someone on keybase
2. Import their key into gpg
3. Sign their key in gpg
4. gitcrypt add-gpg-user ...

I'd like to propose additional functionality that would permit:

1. Follow someone on keybase
2. gitcrypt add-keybase-user ...