Prepare v0.35.0 - #595

Google Cloud PHP v0.35.0

Cloud Core v1.7.0

• The google/auth requirements have been relaxed to allow installation down to v0.9.0. (Relax auth requirements #594)
• A fix for a bug regarding debugOutput in batch calls. (Only emit debug information when debugOutput is enabled #585)
• Introduced flock and semaphore based locking mechanisms. (Introduce flock/semaphore locking mechanisms #592)
• Correct google/proto-client and remove symfony/lock suggestions. (Introduce flock/semaphore locking mechanisms #592)
• Moved Google\Cloud\Core\Batch\SysvTrait to Google\Cloud\Core\SysvTrait and moved Google\Cloud\Core\Batch\SysvTrait::isDaemonRunning() to Google\Cloud\Core\Batch\BatchDaemonTrait. (Introduce flock/semaphore locking mechanisms #592)

Cloud Logging v1.3.1

• A fix for a bug regarding debugOutput in batch calls. (Only emit debug information when debugOutput is enabled #585)

Cloud PubSub v0.6.1

• A fix for a bug regarding debugOutput in batch calls. (Only emit debug information when debugOutput is enabled #585)

Cloud Spanner v0.4.0

• Big thanks to @RyanGordon for a handful of documentation fixes. (A couple of small documenting fixes for Spanner #579)
• Removed suggest on symfony/lock in favor of Google\Cloud\Core\Lock. The Google\Cloud\Spanner\Session\SessionCachePool now defaults to a semaphore based lock (if available) with a back up of an flock based implementation. It's possible to override the lock by supplying a Google\Cloud\Core\Lock\LockInterface implementation to the session pool. (Introduce flock/semaphore locking mechanisms #592)

Cloud Trace v0.3.1

• A fix for a bug regarding debugOutput in batch calls. (Only emit debug information when debugOutput is enabled #585)

Miscellaneous

• Our documentation site received a bunch of great updates, including documentation for extended classes, inheritance, and traits. (Update documentation generation #591)