Added transaction and block message objects.
Added transaction and block message objects.

GroestlCoin/libgroestlcoin,kaostao/libbitcoin,swansontec/libbitcoin,semyazza/libbitcoin,Airbitz/libbitcoin,libtetcoin/libtetcoin-consensus,GroestlCoin/libgroestlcoin,BWallet/libbitcoin,semyazza/libbitcoin,swansontec/libbitcoin,libmetrocoin/libmetrocoin-consensus,libmetrocoin/libmetrocoin-consensus,swansontec/libbitcoin,BWallet/libbitcoin,GroestlCoin/libgroestlcoin,Airbitz/libbitcoin,swansontec/libbitcoin,kaostao/libbitcoin,libmetrocoin/libmetrocoin-consensus,BWallet/libbitcoin,libtetcoin/libtetcoin-consensus,BWallet/libbitcoin,kaostao/libbitcoin,kaostao/libbitcoin,libtetcoin/libtetcoin-consensus,libmetrocoin/libmetrocoin-consensus,Airbitz/libbitcoin,libtetcoin/libtetcoin-consensus,GroestlCoin/libgroestlcoin,libtetcoin/libtetcoin-consensus,libmetrocoin/libmetrocoin-consensus,semyazza/libbitcoin,Airbitz/libbitcoin