Merge tag 'v1.1.1-rc2' of github.com:apache/spark into csd-1.1

[maven-release-plugin]  copy for tag v1.1.1-rc2

Conflicts:
	assembly/pom.xml
	bagel/pom.xml
	core/pom.xml
	examples/pom.xml
	external/flume-sink/pom.xml
	external/flume/pom.xml
	external/kafka/pom.xml
	external/mqtt/pom.xml
	external/twitter/pom.xml
	external/zeromq/pom.xml
	extras/kinesis-asl/pom.xml
	extras/spark-ganglia-lgpl/pom.xml
	graphx/pom.xml
	mllib/pom.xml
	pom.xml
	repl/pom.xml
	sql/catalyst/pom.xml
	sql/core/pom.xml
	sql/hive-thriftserver/pom.xml
	sql/hive/pom.xml
	streaming/pom.xml
	tools/pom.xml
	yarn/pom.xml
	yarn/stable/pom.xml