Create a MySQL Message Queue implementation.
* Created a `MySqlMessageQueue` in the mysql sub module
* Created a `MySqlMessage` that implements `CommandMessage` from core
* Created a `MessageType` enum to determine which type of command is on the message
* Created a `MySqlMessageQueueIntegrationSpec` which exercises 100% code coverage on the queue, including hidden behavior in the SQL
* bin/release.sh script to check for required env variables, run tests, then run `sbt release`
* MAINTAINERS.md that describes steps needed to release
* implemented sbt release to run our release to docker and sonatype
The sbt protobuf plugin we were using forced developers to install
protoc version 2.6.1 on their local. That makes it difficult
to onboard new developers.
sbt-protoc is an alternative plugin. It has a lot of features we
are presently not using. The biggest feature it brings is to
not require developers to install protoc.
* build.sbt - use the new protoc plugin
* VinylDNSProto.proto - add syntax = proto2 to ensure compile
to compatible protobuf version
* plugins.sbt - remove the old protobuf plugin
* protoc.sbt - add the new protoc plugin
* Removing ProtocPlugin as it is an auto-plugin
* Remove uneeded protoc lib dependency
* Update docs to remove protoc requirement
* Remove protobuf install from travis
