You can now build html & js using latest repos via bower, npm & grunt

Hi,

I've created a src directory and now
- bower install brings in all external js dependencies with bower except mnemonic.js, qrcode.js & electrum.js
- npm install - brings in all the dev dependencies for grunt
- grunt does a bunch of things including a kludge that lets us use the latest bitcoinlib-js by browserifying it

A number of things are left to be done
- watch for changes, so auto-compile happens making it easy to develop etc.
- remove the kludge tobitcoinlibjs etc.

@ssr1ram