Merge pull request #19 from jacopen/master

Fix gen-stemcell to support new stemcell-builder
Bump BOSH
Bump BOSH and use DummyPlatform
Bump Bosh and fix `Bosh::Agent::Config` override
Bosh renamed director to bosh-director
Merge pull request #22 from fraenkel/director

Rename director to bosh-director and update Gemfile.lock