Added removeUser functionality.
Added removeUser functionality.

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