Added opcode counting and limit.
Added opcode counting and limit.

bankonme/bitcoinjs-server,dazoe/bitcoinjs-server,bitfloor/bitcoinjs-server,dazoe/bitcoinjs-server,javascriptit/bitcoinjs-server,javascriptit/bitcoinjs-server,zhangweis/node-jds,bankonme/bitcoinjs-server,zhangweis/node-jds,bitfloor/bitcoinjs-server,javascriptit/bitcoinjs-server,dazoe/bitcoinjs-server,bankonme/bitcoinjs-server,zhangweis/node-jds