fake firebase to locally fake firebase for testing or playing.
the Fake firebase relies on JSON loaded from base file names "sample_db.ffb" shopuld have possibility save the JSON to sample_db after some editing is done.
for example for testing purposes, when the connection is limitted or the test case requirements exeeds the free account posibilities
var ref = new FakeFirebase('sample_db');
the rest of functionality copies Firebase
MIT