Default to bosh-stemcell for basic stemcell name
Remove double negative for unknown infrastructure test
Tidying tests to use args and removing duplicate tests
Requires stemcell_tgz and stemcell_version args for stemcell rake task
Use GemGenerator to build bosh_agent gems
Moved manifest path generation for micro stemcell into method bucket
Move guts of stemcell:micro and stemcell:basic into tested class
Inline stemcell.rake
Build gems explicitly for micro as well
Always provide release tarball, on CI and workstations
Add AwsProvider with specs

 * from pr/323
bosh aws cli plugin uses AwsProvider

 * from pr/323
StemcellRakeMethods expects :stemcell_version not :version