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
It looks like you're testing multiple things in this one method, i.e., deserialization to Page, deserialization to Activity, and type conversion.  It might make sense to break this up into multiple tests.