SAMZA-16; fix java 7 test incompatibility
SAMZA-181; add a tutorial to show how to run samza jobs from HDFS.
SAMZA-182; use HADOOP_YARN_HOME instead of YARN_HOME in run-classh.sh.
SAMZA-157; add samza.offset.default configuration for streams and systems.
Seeing issues when running with SAMZA-157, so reverting.

This reverts commit 3a6f2555aa92d47dd85b54f3f1503719c08d31a7.
SAMZA-157; add samza.offset.default configuration for streams and systems.