Initial implementation of pgp
Small changes in response to feedback from SashaCrofter.
Formatted
Add `0x` in front of PGP key when looking it up.
Add `0x` in front of PGP key when looking it up.

Ref #165
Merge branch 'f.pgp' of github.com:ProjectMeshnet/nodeatlas into f.pgp
Change PGP Disabled a little bit, and added a check.

It seems that there was a config option called PGP.PGPDisabled, but it
was set to `true` by default (which we don't want, incase someone
doesn't want PGP), and it was also *never* used. I added a check in
the Send func, and I also changed it from PGP.PGPDisabled to
PGP.Disabled.

Ref #165
Merge pull request #184 from ProjectMeshnet/f.pgp

f.pgp