Release Vision 0.22.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies
* Updates to code examples in documentation

Release Trace 0.23.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Storage 0.23.2

* Allow setting a File's storage_class on file creation
* Allow updating an existing File's storage_class
* Add File#rotate to rotate encryption keys
* Add PostObject and Bucket#post_object for uploading via HTML forms

Release Speech 0.22.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies
* Update links in documentation

Release Pub/Sub 0.23.0

* Add emulator_host parameter
* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Monitoring 0.23.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Logging 0.24.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Natural Language 0.24.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Error Reporting 0.23.0

* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies

Release Datastore 0.24.0

* Add emulator_host parameter
* Fix GRPC retry bug
* The client_config data structure has replaced retry_codes/retry_codes_def with retry_codes
* Update GRPC/Protobuf/GAX dependencies