SAMZA-370; document job.systemstreampartition.grouper.factory in config table
SAMZA-384; eliminate send method in task instance and send messages from collector immediately.
SAMZA-382; properly shutdown jmx server when an exception occurs in samza container
SAMZA-381; update docs for log4j jmx appender.
SAMZA-377; switching run-class.sh to use java home instead of hard coding java
SAMZA-361: Remove Grizzled SLF4J
SAMZA-386: Use Travis for continuous integration