Improve timing tests by using sinon fake timers.
Round to the closest millisecond.
Merge branch 'master' of https://github.com/PencilCode/musical.js into bw21

* 'master' of https://github.com/PencilCode/musical.js:
  Round to the closest millisecond.
  Improve timing tests by using sinon fake timers.

Conflicts:
	musical.min.js
fixed the test (passing origin) according to work with commit 2798fc7