Check that history is supported before trying to replaceState
Check that history is supported before trying to replaceState

ReactJSTraining/history,PactCoffee/history,rackt/history,mjackson/history,knowbody/history,narr/history,ReactJSTraining/history,knowbody/history,knowbody/history,narr/history,iam4x/history,PactCoffee/history,iam4x/history,reactjs/history,rackt/history,iam4x/history,mjackson/history,narr/history,reactjs/history,PactCoffee/history,ReactTraining/history