upgrade to react-native v0.5.0
upgrade to react-native v0.5.0

#22

APSL/tcomb-form-native,gcanti/tcomb-form-native,enozr/tcomb-form-native,iDay/tcomb-form-native,miqmago/tcomb-form-native,jonaswindey/tcomb-form-native,joshprismon/tcomb-form-native,trbngr/tcomb-form-native,buhe/tcomb-form-native,shashi-dokania/tcomb-form-native