Added test unit for script engine.
Added test unit for script engine.

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