Streams 145

Added a FacebookEventClassifier and updated the FacebookTypeConverter to respond to both Post and Page types from facebook4j. Added in a Page json schema that gets converted to a POJO. Also added in/updated all relevant tests
I think the issue here was that you get a compiler error if you don't catch the IO and Mapping exception. I can remove the try catch from here, but I'll need to add a throws to the method signature