Added script to easily keep track of and vendor packages
Squashed 'vendor/src/github.com/fsouza/go-dockerclient/' content from commit d639515

git-subtree-dir: vendor/src/github.com/fsouza/go-dockerclient
git-subtree-split: d639515f70e535d4bbff8499992beeb48d8bf340
Merge commit 'a677d290747a2c2af60757d7a871c91b30102c0c' as 'vendor/src/github.com/fsouza/go-dockerclient'