Removed existing PubSubWebSocket operator tests and helpers #54
Added test that tests PubSubWebSocketInputOperator and PubSubWebSocketOutputOperator fixes #54
Added comments that the web socket message parsing and composing will be available from API and the users should not rely on the code that is doing it currently in the library #54.
Fixed warnings #54.
added error message
#15

Merge remote-tracking branch 'origin/master'

Conflicts:
	library/src/test/java/com/datatorrent/lib/io/PubSubWebSocketInputOperatorTest.java
	library/src/test/java/com/datatorrent/lib/io/PubSubWebSocketOutputOperatorTest.java