Update sha256 and md5 sum for Docker master branch binary build

Hi,

The docker.tgz.md5 and docker.tgz.sha256 files has NOT been updated for 5 days. The latest binaries are being uploaded, but the checksum files do not match anymore. Some part of the auto build process seems broken. Can someone have a look.

https://master.dockerproject.org/

Thanks,
Larry