Fix line endings

Here is a pull request for the .gitattributes file.  As usual, I don't  know why the two commits from Joel are showing up in the pull request.  You pushed them to the main repo after I forked and I pulled them to my fork to stay up-to-date.  I don't know how the heck to keep from being part of the pull requests though seeing as how both those commits are already on the dev branch of the main repo.