Updated Bundle constructor to accept only id and not generator
Updated Behavior constructor to accept only id and not generator
Updated Analysis constructor to accept only id and not generator
Updated MalwareSubject constructor to accept only id and not generator
Updated Package constructor to accept only id and not generator
Removed timestamp autogeneration in to_obj
Updated example1 to account for updated interfaces
Multiple changes; added Collections class, changed collection instantiation/addition/manipulation logic
Fleshed out to_obj and to_dict methods
Updated version to 4.0.0a2