Made mkimage script path overridable with environment
Merge pull request #11 from moul/patch-1

Made mkimage script path overridable with environment
Quote MKIMAGE to account for obscene paths
Add "commits:" section to generate-stackbrew-library.sh output
s!dotcloud/docker!docker/docker!g
Merge remote-tracking branch 'tianon/master'
carry environment variables in need

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
add Dockerfile directly

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
skip built images/tags

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
fix continue statement not taking effect

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>
populate multi-arch rootfs archives

Signed-off-by: You-Sheng Yang <vicamo@gmail.com>