Add a rock spec.

Hello there,
Seeing #38, and wanting to run this myself, I created a rock spec. 
Some things I am not sure about (this is my first, ever):
- the version.  I don't even know what scm-1 means.
- The ugliness. Can this be improved? I generated it with a script, but seems to work.
- are the test files supposed to be included too?

Hope this helped.