Treat "." and ".." as directories in ADD command destination
Docker-DCO-1.1-Signed-off-by: Amrut Joshi <amrut@badboy.com> (github: rumple)
Merge branch 'master' of https://github.com/rumple/docker

Docker-DCO-1.1-Signed-off-by: Amrut Joshi <amrut@badboy.com> (github: rumple)