Added schema definition for message format (the standard "ok" and "message" properties we use for many requests).
Removed older routes left over from Express 3.
Updated API docs to include "revisions" and "children" flags.  Added placeholder notes to all tests and modules to facilitate actually building the features.
Update message JSON Schema to add optional "record" and/or "records" (for example, when a receipt is delivered after updating a record).
Added child array definitions to JSON schema for terms.
Added "versions" array definition to record JSON schema.