* improves error handling and reporting
* uses run_command to reduce code
* fails quicker on errors as opposed to return codes and tracebacks
* can now also specify the key as data versus needing to wget it from a file
Pretty straightforward. Give it a URL with an exported GPG key for signing an
Apt repository. It downloads it and will install it using apt-key. It's even
smart enough to tell if it's already there (i.e. actually tells you if it
changed or not).
