Introduce stemcell repo

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Move jobs package up to release to avoid cycle dependencies when resolving packages for jobs

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Re-organize imports.

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>