half update index.html and relative js. in order not to redirect to logout page directly.

void the session checking function for testing
1. Add coffeescript temp src folder
2. Add twitter bootstrap css/img and js files also remove the unpacked files
3. change the image path in css file to match the current structure
4. Re-structure index.html page to default.html also modify main.css to new_main.css to fit items' position error
5. use the scaffold form twitter bootstrap structure.