Several patches related to ONMjs signalling...

... Added debug console logging to the store reifiers dispatchCallback method (useful for auditing signal dispatch). Added onSubcomponentUpdated and onSubnamespaceUpdated methods to the test observer "canary", and modified the core ONMjs.Address adding getHumanReadableString method (split this code from the getHashString method - we need both human-readable and the base64-encoded hash).