Add additional owners to your Gemcutter gems

Thanks to John Nunemaker for this tip.

If you need to add additional owners to your gems on Gemcutter, you can use the gem owner command like so:

$ gem owner -a codemonkey@example my-cool-gem
Added owner: codemonkey@example.com
Owners for gem: my-cool-gem
- codemonkey@example.com
- codeslinger@example.com

Hopefully this feature will be included in the web interface soon. How about forking Gemcutter and beating me to the punch?