Fixing case of silly states on os x, where files are owned by "nobody" and File.stat returns a huge number. I thought i had already fixed this, but apparently not. I added a test, and it is definitely fixed now.

git-svn-id: https://reductivelabs.com/svn/puppet/trunk@1626 980ebf18-57e1-0310-9a29-db15c13687c0