add <atomic> to types.hpp header.
add <atomic> to types.hpp header.

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