adding feature #528 add require_all_fields flag to PayloadJsonDecoder
removing decoders_test.go to resolve merge conflict since it has been removed from dev
Merge branch 'dev' into features/issue_528
adding 'test require_all_fields' to payload_decoder_test
Merge pull request #529 from michaelgibson/features/issue_528

adding feature #528 add require_all_fields flag to PayloadJsonDecoder