Release Firestore 0.20.0

* First release

Release BigQuery 1.0.0

* Release 1.0.0
* Update authentication documentation
  * Update Data documentation and code examples
  * Remove reference to sync and async queries
* Allow use of URI objects for Dataset#load, Table#load, and Table#load_job

Release Google Cloud 0.49.0

* BigQuery 1.0.0 release
  * Update authentication documentation
    * Update Data documentation and code examples
    * Remove reference to sync and async queries
  * Allow use of URI objects for Dataset#load, Table#load, and Table#load_job
* Firestore 0.20.0 release
  * First release

Release Stackdriver 0.13.0

* Trace 0.30.0 release.

Release google-cloud-trace 0.30.0

Release google-cloud-os_login 0.1.0

Release google-cloud-dlp 0.1.0

Release google-cloud-dataproc 0.1.0

Release google-cloud-container 0.1.0

Release google-cloud 0.48.0

* Container 0.1.0 release.
* Dataproc Login 0.1.0 release.
* DLP 0.1.0 release.
* OS Login 0.1.0 release.
* Trace 0.30.0 release.