"now" won't return current Unix time if perf presented #69

I've tried using Signal.Time.every in a Elm-like fashion (sending messages with a Unix timestamp applied), but instead it returns time from the session (kinda) start, because it relies on performance and process, using Date.now as a fallback only.

The closest workaround is copying everyP and re-implementing now in own foreign module.

But either or both:

• the documentation really should note that moment (from which JS object it takes current time)
• every instance for Unix time dispatching should be presented