Add a run_multiversion.sh script that downloads a variety of Docker
engines and runs the integration tests against each of them.
Skip some of the tests when running with Docker 1.6.0. It has a bug that
prevents these tests from completing successfully.
Fixes#751
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Remove Makefile in favor of run.sh script or manual instructions.
Update readme to reflect instructions for running integration tests.
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)