* Fix Ubuntu/Debian installation instructions.
* Fix Ruby package name. It's supposed to be ruby-daemon-controller, not
daemon-controller-ruby.
* Add Ubuntu and Debian installation instructions.
* Add Debian packaging files.
* Add documentation about cryptographic verification and promote the use of
rubygems-openpgp-ca.
* Rename package:upload to package:release, and have it automatically create &
upload a tag too.
* Fix package:upload task.