Added the database schema file

login,register ui redesigned,using bootstrap framework

minor changes in index.php

registration made exclusive

changes made to registration page, seniors can create id's and users on the fly, as well as StudentXXXXXXX database is updated, with basic info
differentiaion b/w seniors and juniors is made on basis of 'id'

database perm. changed

Navigation to registration from senior and vice-versa enabled

final registration changes
seniors can create 'any' users from register.php,comments cleaned up