dropped all references to JsonDecoder
updated tests and documentation to remove references to JsonDecoder
Issue #467 Add delta output to circular buffers
Merge pull request #469 from crankycoder/features/415-remove-jsondecoder

Features/415 remove jsondecoder
Issue #467 Ignore a zero delta

Fix timestamp in parsed output comments
Issue #467 fix error check
Issue #467 Remove extraneous external definitions
Issue #467 fix the table index in the ref table removal
Merge pull request #470 from mozilla-services/issue_467

Issue 467