* updated Gruntfile
* fixes some jade markup, added additional elements
* melody.js rewritten
* manifest.app updated
major changes
* added basic icons in icons.css in base64 encoding
* added modules backbone, underscore, asyncstorage, mediadb
* many changes at melody.js
* added main markup at melody.html
* renamed manifest.app to .webapp
* added a small module, on top of async_storage.js for melody