Merge pull request #253 from chrischernoff/contribution-guidelines

Update paths in Contribution guidelines

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 So you want to contribute to the project. **THIS IS GREAT NEWS!**  Seriously. We're
 all pretty happy about this. All of the [instructions for contributing from 
-the homebrew-cask project](https://github.com/phinze/homebrew-cask/blob/master/CONTRIBUTING.md) 
+the homebrew-cask project](https://github.com/caskroom/homebrew-cask/blob/master/CONTRIBUTING.md)
 apply, and won't be repeated here. The only changes concern getting set up to
 contribute:
 
@@ -13,6 +13,6 @@ contribute:
 
 ```bash
 github_user='<my-github-username>'
-cd $(brew --prefix)/Library/Taps/caskroom-versions
+cd $(brew --prefix)/Library/Taps/caskroom/homebrew-versions
 git remote add $github_user https://github.com/$github_user/homebrew-versions
 ```