reference.conf: don't block Kafka, adapt defaults

If it cannot keep up, that problem should be identified by metrics and
not affect the listeners.
EndOfPipeline: ignore QueueFullExpection

Already tracked in Kafka metrics and exposed via stats interface.
build.gradle: bump deps
build.gradle: v3.0.1
Merge pull request #33 from airbnb/pierre/no_blocking_on_kafka

Don't block on kafka, update deps