added support for udf objects in jobgraphbuilder
Merge branch 'master' of https://github.com/stratosphere/stratosphere-streaming

Conflicts:
	src/main/java/eu/stratosphere/streaming/api/streamcomponent/StreamComponentHelper.java
	src/main/java/eu/stratosphere/streaming/api/streamcomponent/StreamSource.java
	src/main/java/eu/stratosphere/streaming/examples/wordcount/WordCountLocal.java
	src/main/java/eu/stratosphere/streaming/rabbitmq/RMQTopology.java
	src/test/java/eu/stratosphere/streaming/api/streamcomponent/StreamComponentTest.java