An implementation of Trellis EventService that publishes events to Google Cloud PubSub.
Set property GOOGLE_APPLICATION_CREDENTIALS in gradle.properties to the path of the PubSub service
admin credential file.
See https://developers.google.com/identity/protocols/application-default-credentials for details.
This code requires Java 8 and can be built with Gradle:
./gradlew install
The IT depends on Annotation Processing and Google Auto. If your IDE does not generate the symbol, check this issue for information: google/auto#106