Add cgroup-bin dependency to our Ubuntu package

Since cgroup-bin is only "recommended" by the lxc package on Ubuntu, but is necessary for having the proper cgroups mounted for Docker to function, this makes some sense for us to add separately.

Fixes #2990
add a little prose to tell the user that run creates a container, and then starts it
If container does not exist try to remove the name and continue
Merge pull request #2955 from crosbymichael/search-name-first

Search for repo first before image id
Merge pull request #3006 from tianon/ubuntu-cgroup-bin

Add cgroup-bin dependency to our Ubuntu package
Merge pull request #3078 from crosbymichael/remove-name-if-not-exist

If container does not exist try to remove the name and continue
Merge branch 'docker-run-prose-2149' of github.com:SvenDowideit/docker into 3036-test
Clean up quoting, wraps, and build error on code-block.
Enable engine to take Stderr and Stdout for mocking in tests