Update readme to describe worker.

Update README.md

Update metronome.js

Fix for autoplay

Merge pull request #11 from neuhaus/patch-1

Merge pull request #15 from hmoffatt/master

Unlock audio context on iOS by playing a dummy buffer first

Fixes issue #13

Added license (fixes issue #12)

remove http protocol from URL to prevent mixed media

Merge pull request #6 from cwilso/worker

Implemented Worker-based timer

if clause bug fix.

Updating for current Web Audio spec, moving webkit prefix to monkeypatch.

Merge pull request #3 from nofatclips/patch-1