add cli

Hi there, I know this project is super old, but I stumbled upon the github blogpost about it and I thought it was pretty awesome. I hacked together a quick bin which seems to do mostly all I want. It's really simple with no cli args. 
I didn't update the gemspec as I don't know if that's like updating the version.rb file. (I'm also not familiar with jeweller).

What do you think?

thanks,