Idea: Deployment Keys

_From @scottrobertson on June 16, 2015 8:17_

Hey,

It would be quite cool if we could add deployment keys to a project. The work around right now is to create a deployment user, but that is a bit cumbersome.

When adding deployment keys, we should have the ability to supply our own, or have deis generate a keypair automatically (and return the public key so we can add it to CI).

_Copied from original issue: deis/deis#3875_