Show how to retrieve messages from the `logging` exchange.
Using `ccnq3.log` where it makes sense.
Correcting `console.log` to `console.error` where needed.

Only in bin/ccnq3 for now, but other scripts could use that as well.
simplify: ccnq3 just console.dir()s the message
lib/ccnq3: simplify code, using `ccnq3` as alias for `module.exports`
lib/ccnq3: `ccnq3.db.add_user`, `ccnq3.db.add_roles`
publish version 0.4.7
bin/ccnq3: `set local defaults` shares common code; use new ccnq3 APIs.
bin/ccnq3: `add user`
bin/ccnq3: `add host`