First attempt adding request animation frame support
Simplified timeOffset calculation
add enabled/disable step click
create a more general option for tapping
Merge pull request #50 from gerdadecio/master

add enabled/disable step click
Option to trigger requestAnimationFrame & polyfill
Merge changes from upstream/master
Use requestAnimationFrame in 2 last examples
Merge pull request #47 from w0rm/18-request-animation-frame

Request animation frame
Merge branch 'master' into gh-pages