Correct transitionend events

https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions?redirectlocale=en-US&redirectslug=CSS%2FTutorials%2FUsing_CSS_transitions
http://msdn.microsoft.com/en-us/library/ie/hh673535(v=vs.85).aspx#transitions_dom_events
https://github.com/Modernizr/Modernizr/blob/20abb842b56823b7ec66bbe6d45e388dc76df67e/src/prefixed.js