Added a JSON payload formatter (#22)
* Initial working version of JsonPayloadFormatter and unit tests
* make JsonPayloadFormatter Configurable
* Add key/value schema visibility control
* Use logging for formatter test output; configure with src/test/resources/simplelogger.properties
* Fix schema visibility
* Java import clean-up
* Test lambda function dumps event as json
* Add JsonPayloadFormatter description to README
* Restored connect node
* Use enum for visibility; updates from review comments
* Use overloaded methods
* Add support for batch in JsonPayloadFormatter
* Clean up Invocation payloads section
* Add integer, long, boolean key tests; remove some constants in tests as it actually made the code less understandable
* Cleaned up example avro schema
* Remove testing artifact names from example
* v1.0.0
