enable docker run -it

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
add a little bit mentioning commandline option combinations

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #2 from SvenDowideit/docker_run_-it_docs

add a little bit mentioning commandline option combinations

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4321 from vieux/docker_run_-it

Add support for docker run -it or docker images -qa