Kafka 1.1.0 - Confluent 4.1.0 - Bug Fix + New Features

• Added gRPC endpoint to perform API calls on KSM (the goal is to build a UI on top of KSM)
• Feature flag for gRPC server (off by default)
• Added gRPC reflection service
• updated to 1.1.0-kafka1.1.0-nosr
• Added gRPC gateway service (REST)
• Fixed a nasty stability issue (#20).
• using ScalaFMT instead of Scalariform
• Added Read-Only mode (enabled by default) to make KSM more safe for new users (setting is KSM_READONLY and should be explicitly set to false for production)
• Renamed a few environment variables in KSM (breaking)
• NoAclSource is now the default AclSource (to be used with KSM_READONLY=true)
• Artifacts are now deployed to Sonatype / Maven Central