orocos_kdl 1.1.99: initial commit

orocos_kdl has, as far as I can tell, no .tar.gz or other distribution package. Thus, I have provided only a .git url, and I don't know what to put for the sha1. The install works, but the audit complains. I thought I'd just send a pull request because I can't find any info about what to do in this case.
I've run through the Formula Cookbook and everything else seems to be kosher.
Thanks!