switching to apt-key so that we can use port 80 to get around a restrictive proxy
see this post: http://superuser.com/questions/64922/how-to-work-around-blocked-outbound-hkp-port-for-apt-keys
Removed commented out lines
Retrieve the signing key for Nginx from nginx.org

The key we were using is way outdated from when we actually used
the Ubunto repositories for nginx. We can grab the signing key
from Nginx on the fly and apply it before installing.
Provide output beyond generated "OK" for nginx signing key
Clean up processing of nodejs signing key
Merge pull request #495 from Varying-Vagrant-Vagrants/pr/446

[PR] Clean up GPG signing key handling

Fixes #446