Merge pull request #50 from pnasrat/new-docker-repo

Fix references to dotcloud repo.

Author: dmcgowan

CONTRIBUTING.md

@@ -8,6 +8,6 @@ the same rules and principles. If you're already familiar with the way
 Docker does things, you'll feel right at home.
 
 Otherwise, go read
-[Docker's contributions guidelines](https://github.com/dotcloud/docker/blob/master/CONTRIBUTING.md).
+[Docker's contributions guidelines](https://github.com/docker/docker/blob/master/CONTRIBUTING.md).
 
 Happy hacking!