Converted to node module

Converted to npm package
Added brower
Added browserify with minification
Updated Readme

lib/index.js

@@ -0,0 +1,6 @@
+var web3 = require('./main');
+web3.providers.WebSocketProvider = require('./websocket');
+web3.providers.HttpRpcProvider = require('./httprpc');
+web3.providers.QtProvider = require('./qt');
+
+module.exports = web3;