SAMZA-351; rename environment.gradle to customize.gradle and move it to the bottom of the list
SAMZA-225: add a Spark Streaming comparison
SAMZA-352: Scala 2.9.2 build broken after SAMZA-337
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-samza
Merge branch 'master' into s71

Conflicts:
	samza-core/src/test/scala/org/apache/samza/util/TestUtil.scala