Update changelog for ED beta 15+ changes
Update changelog for ED beta 15+ changes

MattMSumner/emberfire,rtablada/emberfire,FirebaseExtended/emberfire,rtablada/emberfire,FirebaseExtended/emberfire,leifcr/emberfire,MattMSumner/emberfire,leifcr/emberfire,FirebaseExtended/emberfire,FirebaseExtended/emberfire,IsaiahJTurner/emberfire,IsaiahJTurner/emberfire