Changes serialization code in wallet.
Changes serialization code in wallet.

IMPLEMENT_SERIALIZE --> ADD_SERIALIZE_METHODS

Uses Bitcoin's latest serialization implementation.

GregoryBetz/DarkSilk-Release-Candidate,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk-Release-Candidate,GregoryBetz/DarkSilk-Release-Candidate,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk-Release-Candidate,GregoryBetz/DarkSilk-Release-Candidate,GregoryBetz/DarkSilk,GregoryBetz/DarkSilk-Release-Candidate