Removed references to Persona auth provider
Removed references to Persona auth provider

cesarmarinhorj/angularfire,jamestalmage/angularfire,itxd/angularfire,itxd/angularfire,nbr1ninrsan2/angularfire,bpietravalle/angularfire,bpietravalle/angularfire,bpietravalle/angularfire,fbentz/angularfire,jamestalmage/angularfire,nbr1ninrsan2/angularfire,douglascorrea/angularfire,fbentz/angularfire,jamestalmage/angularfire,douglascorrea/angularfire,douglascorrea/angularfire,denisKaranja/angularfire,fbentz/angularfire,yoda-yoda/angularfire,FirebaseExtended/angularfire,yoda-yoda/angularfire,cesarmarinhorj/angularfire,nbr1ninrsan2/angularfire,FirebaseExtended/angularfire,itxd/angularfire,denisKaranja/angularfire,cesarmarinhorj/angularfire,FirebaseExtended/angularfire,yoda-yoda/angularfire,denisKaranja/angularfire