dotcloud/docker — pull request #6580 by vieux (2014-06-20 22:52:49+00:00)
Title: Allow docker cp to copy host->container, container->host, container->container

Closes #5846

This allows:

`docker cp :/path path`
`docker cp path :/path`
`docker cp :/path :/path`

With container to container, to keep the code simple (for now?) the content goes through the client's fs.

Needs `API` bump & doc

This one needs a lot of testing @crosbymichael @tiborvass @unclejack @LK4D4