html5 classList api is fast.
feature: use classList api when provided
merge classList changes from team-lab
merge classList changes from team-lab
Merge branch 'codename' into classlist

Conflicts:
	src/dom.js
Merge branch 'codename' into classlist

Conflicts:
	src/dom.js
Merge branch 'codename' into classlist

Conflicts:
	src/dom.js
merge upstream performance fixes from Handsontable
build current version after performance fixes