No longer log from henry and return Error objects for HTTP code errors.
Prototype style to avoid timer spam.

A single timer updates all registered clients.
No trailing slash required for api option.
Don't start unless initial refresh works.
Set default props always.
Restore deleted error helper.
Add bind for setInterval call.
Update tests.
Remove `remove()`.
EventEmitter: refresh and error events.
Add README. Closes #1.
Enhancing business logic.
typos
Merge branch 'proto'

Conflicts:
	README.md