Switch master to v0.4.1.
Updated Docker to v0.7.6.
Merge pull request #51 from opdemand/docker-0.7.6

Updated Docker to v0.7.6, tested.
don't need both metadata.json and metadata.rb
skip docker steps if already installed

This will reduce lookups to get.docker.io on chef runs
* save a small amount of time for chef runs
* if get.docker.io is unavailable it won't break run.
Merge pull request #55 from paulczar/fix_docker

skip docker steps if already installed
Cleanup inactive runtime slugs
Merge pull request #59 from appcubator/runtime-cleanup2

Cleanup inactive runtime slugs
Fix caching of the slugs
Merge pull request #60 from appcubator/runtime-cleanup2

Fix caching of the slugs
fix typo in runtime slug test
Merge pull request #53 from paulczar/metadata

Chef docs say you are correct, sir. :) Tested and seems to work fine without metadata.json in the repo.
Merge branch 'master' into release
Updated for v0.4.1 release.