Move Storm-related classes to sub-packages
Remove METRICS logging appender
Add Spark Streaming example that reads from Kafka and writes to Kafka
Use val for Storm version
Use val for Bijection version
Use val for Chill version
Use G1 garbage collector (requires Java 1.7.0u4+) for JVMs launched via sbt
Don't shorten classnames in test logs
Simplify log4j.properties
Merge branch 'feature/spark-streaming-rewrite' into develop