Release Vision 0.23.0

Major release, adding V1.1 support.

* Support image URLs from the internet, not just Cloud Storage.
* Add document text detection feature, like text but for longer documents.
* Add crop hints feature.
* Add web annotation feature
* Update GRPC header value sent to the Vision API.

Release Trace 0.23.2

* Update GRPC header value sent to the Trace API.

Release Storage 0.24.0

* Dependency on Google API Client has been updated to 0.10.x.

Release Speech 0.22.2

* No public API changes.
* Update GRPC header value sent to the Speech API.

Release Resource Manager 0.22.0

* Dependency on Google API Client has been updated to 0.10.x.

Release Pub/Sub 0.23.2

* No public API changes.
* Update GRPC header value sent to the Pub/Sub API.

Release Monitoring 0.23.2

* Update GRPC header value sent to the Monitoring API.

Release Logging 0.24.2

* No public API changes.
* Update GRPC header value sent to the Logging API.

Release Natural Language 0.25.0

* Removal of  method argument, encoding now calculated from system settings.
* Updated documentation and code examples.
* Update GRPC header value sent to the Natural Language API.

Release Error Reporting 0.23.3

* Update GRPC header value sent to the Error Reporting API.