storage: Initial commit of types.
Renaming Blob to Object to be consistent with GCS terminology.
Introduce a service layer.
Keep entity state in *Info objects.
storage: Introducing RoundTripper as a connection object.
storage: Add GCS scope constants.
storage: Use the correct client version.
storage: Code reorg for types, implement NewReader.
storage: adding an object writer.
storage: docs rewording.
storage: Minor docs fixes.