Add dependency on JSON-RPC.
Add dependency on JSON-RPC.

Also added Bill as contributor and fixed repo url.

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