added binding.gyp file for building native.node with node-gyp
added binding.gyp file for building native.node with node-gyp

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