readded namespace 'bc' alias
readded namespace 'bc' alias

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