Timeout Transition Group incorrect documentation

[pracucci]

A couple of not-updated information in the doc:

1. http://khan.github.io/react-components/#timeout-transition-group says it depends on jQuery, but it's no more
2. timeout-transition-group.jsx sources says "Currently there is only one timeout specified, but in the future it would be nice to be able to specify separate timeouts for enter and leave", now there are separate timeouts

BTW great job with TimeoutTransitionGroup. Kudos.