BATS -> integration test: list vms
Move common simple deployment code to helper.
Eagerly initialize collaborators, use more current names
Gather dependencies on candidate
Start moving knowledge about dirs into stemcell environment
Stop passing values between objects via ENV
Push ENV access down
Encapsulate spec_name in StemcellBuilderOptions
Pass StemcellBuilderCommand collaborators instead of primitives
Inject StemcellBuilderOptions into StemcellRakeMethods
Add missing require