Fixed clean_directories recursive double path

The $file variable normally already contains the path, so it shouldn't be added once more

Signed-off-by: Jesse Dobbelaere <jesse@dobbelaere-ae.be>
Merge pull request #33 from jessedobbelaere/clean-directories-pathfix

Fixed clean_directories recursive double path
Merge branch 'master' of https://github.com/BrunoDeBarros/git-deploy-php