added jquery as direct dependency of doAfterTransition
made overlay a separate element to teh content wrapper
cleared out unecessary Modernizr code
removed prefixr and consuming o-useragent as dependency instead
Merge branch 'refactor-prefixr' of https://github.com/Financial-Times/o-dialog into refactor-prefixr

Conflicts:
	js/prefixr.js
put presets in a simpler format
using o-useragent#prefixer