Created all manual pages in Markdown. Container for conversion.

All Docker commands have a Markdown page.
Dockerfile used to build a Fedora based pandoc container.
md2man-all.sh is used inside the container.
README.sh includes an explaination on how to build the fedora/pandoc
          image and how to run the container directly.

 Changes to be committed:
	new file:   contrib/man/md/Dockerfile
	new file:   contrib/man/md/README.md
	new file:   contrib/man/md/docker-attach.md
	new file:   contrib/man/md/docker-build.md
	new file:   contrib/man/md/docker-commit.md
	new file:   contrib/man/md/docker-cp.md
	new file:   contrib/man/md/docker-diff.md
	new file:   contrib/man/md/docker-events.md
	new file:   contrib/man/md/docker-export.md
	new file:   contrib/man/md/docker-history.md
	new file:   contrib/man/md/docker-images.md
	new file:   contrib/man/md/docker-import.md
	new file:   contrib/man/md/docker-info.md
	new file:   contrib/man/md/docker-inspect.md
	new file:   contrib/man/md/docker-kill.md
	new file:   contrib/man/md/docker-load.md
	new file:   contrib/man/md/docker-login.md
	new file:   contrib/man/md/docker-logs.md
	new file:   contrib/man/md/docker-port.md
	new file:   contrib/man/md/docker-ps.md
	new file:   contrib/man/md/docker-pull.md
	new file:   contrib/man/md/docker-push.md
	new file:   contrib/man/md/docker-restart.md
	new file:   contrib/man/md/docker-rm.md
	new file:   contrib/man/md/docker-rmi.md
	new file:   contrib/man/md/docker-run.md
	new file:   contrib/man/md/docker-save.md
	new file:   contrib/man/md/docker-search.md
	new file:   contrib/man/md/docker-start.md
	new file:   contrib/man/md/docker-stop.md
	new file:   contrib/man/md/docker-tag.md
	new file:   contrib/man/md/docker-top.md
	new file:   contrib/man/md/docker-wait.md
	new file:   contrib/man/md/docker.md
	new file:   contrib/man/md/md2man-all.sh