fix routes not initialized on parent componentDidMount
fix routes not initialized on parent componentDidMount

Since setState is async then on componentDidMount of parent the router is not initialized yet and running Actions.someRouter() results in Actions.callback is not defined exception.
gijoehosaphat/react-native-router-flux,charpeni/react-native-router-flux,Wondermall/react-native-router-flux,gectorat/react-native-router-flux,Wondermall/react-native-router-flux,gijoehosaphat/react-native-router-flux,gijoehosaphat/react-native-router-flux,gectorat/react-native-router-flux,Wondermall/react-native-router-flux,Swordsman-Inaction/react-native-router-flux,mcabs3/react-native-router-flux,dmazin/react-native-router-flux,mcabs3/react-native-router-flux,charpeni/react-native-router-flux,charpeni/react-native-router-flux,Swordsman-Inaction/react-native-router-flux,gectorat/react-native-router-flux,peteychuk/react-native-router-flux,dmazin/react-native-router-flux,peteychuk/react-native-router-flux,aksonov/react-native-router-flux,mcabs3/react-native-router-flux,Swordsman-Inaction/react-native-router-flux,dmazin/react-native-router-flux,peteychuk/react-native-router-flux