Integrate a sanity check to avoid uploading private keys

[AlexanderWillner]

Not sure how the library can be misconfigured to upload private keys, but it should not be possible. See https://twitter.com/g33kspeed/status/491692404278194176

[tanx]

If I understand correctly, openpgpjs doesn't even implement hkp. How is this an OpenPGP.js issue?

[AlexanderWillner]

Oh, right. Thanks. Thought hkp has been integrated in and been used from within opgjs...