Version 0.5.0

• Use sbt TestsListener to start/stop cluster around the test task.
  Not before nor after like before. Which also mean you can now use
  any test commands multiple times in the same sbt session.
• Auto import all redis-plugin keys. No more import redis.embedded.util.{Architecture, OS}
  in your build.sbt.
• Simplify the RedisInstance creation for a single server (no Seq needed)