FALCON-11 Add support for security in Falcon. Contributed by Venkatesh Seetharam
Merge remote-tracking branch 'origin/apache-ref/master' into baikal-GA-0.5.0

Conflicts:
	hadoop-webapp/pom.xml
	messaging/src/main/java/org/apache/falcon/messaging/MessageProducer.java
	messaging/src/test/java/org/apache/falcon/messaging/FalconTopicProducerTest.java
	pom.xml
BUG-13577 Added HCatalog/Hive dependency nampespace changes
BUG-13577 fix httpclient transitive dependency hell and missing jsp-api for runtime
FALCON-242 Post processing is not called in Retention workflows. Contributed by Shaik Idris
Merge remote branch 'origin/apache-ref/master' into baikal-GA-0.5.0