finish uers' comment area
finish the user system
finish the sign_in sign_up interface
finish the comment notice part
modify each page's html title and use collection for comments partial
finish favicon
replace a new favicon
finish the user information page
finish the notice bar and some other interface
finish the email system in development enviornment
the app can be log in by facebook
finish the last part
finish the user image upload
finish user image upload
finish the global enviornment variable stuff