v0.12.0

CHANGED

• core: service credentials are now retrieved through the cloud-foundry service_credential_bindings API instead of
  reading VCAP_SERVICES from the app's environment. this is a meaningful step towards supporting service-keys in
  addition to app bindings. credential lookups no longer depend on whether VCAP_SERVICES is provided inline or
  via file.

• srv: --server-env now handles file-based VCAP_SERVICES (fixes #140).

• core: cache window for cf app info was shortened from 12 hours to 4 hours.

• hdi, svm: readonly list commands --hdi-list, --hdi-long-list, --svm-list, --svm-long-list now reuse the
  persisted app-info cache.