Add support for creating and signing with ECDSA OpenPGP keys Change-Id: I6d530325ab801ba800187b88e8cfea079cfa41ed Reviewed-on: https://go-review.googlesource.com/20608 Run-TryBot: Adam Langley <agl@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jacob H. Haven <jacob@jhaven.me> Reviewed-by: Adam Langley <agl@golang.org>