relayout the project and wire up the UI with backend api

1. set the directory layout as phonegap www
2. use angularjs as the data-model manipulator
3. use jquery as the ajax fetcher and poster
4. wire up the whole UI with rest api

TODO:
1. more animation when switching the pages
2. to capture and upload the photo
3. fix the data pattern inconsistent between data-model and UI view.