Merge pull request #4419 from SvenDowideit/tweak-DCO-hook-for-windows

Fix newlines echoing in DCO git hook contrib script
Merge pull request #12 from SvenDowideit/add-libcontainer-minor-doc-tweak

very minor spelling
Merge pull request #4327 from crosbymichael/add-libcontainer

Add native execution driver to docker and make it the default
nope, echo -e isn't portable

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)