Performance improvements

Huge performance improvements for both UI and player.

Full refactoring - AngularJS app

• Full refactoring
• Improved app structure
• AngularJS framework for a more opinionated way to organice the app and code
• New UI
• Remote control
• Play any url/magnet torrent
• Keyboard navigation
• Playing queue
• Settings support
• Update of node-webkit and all npm modules to latest versions