Reuse previously introduced `now` helper to get current timestamp
Merge pull request #140 from pangratz/massive_guid_performance_improvement

Reuse previously introduced `now` helper to get current timestamp
RSVP.async and the internal config.async should always be the same.

- remove asyncDefault
tidy-up denodeify

- it should use idiomatic Promise Construction
- an optional binding at denodeification time.
tidy-up and reuse helpers
update es6 module transpilar

- needed to update the loader to support relative requires
Update README.md