0.5.1

Fixes

All

• Reduce gRPC dependency footprint. In particular, some gRPC-related dependencies are removed from google-cloud-core module. Get rid of duplicate classes (#1365)

Datastore

• Deprecate DatastoreOptions.Builder's namespace(String) setter in favor of setNamespace(String), undo deprecating Transaction.Response.getGeneratedKeys() (#1358)

• Avoid shading javax package in google-cloud-nio shaded jar (#1362)