Changes in config

- autoload libraries and helpers
- include encryption key to use session
Added on song and album controllers and models
Trying out user authentication

- password hash
- autologin
- user details in session
- allow reset password
- allow captcha
make user for database as cs2102

please create a user called cs2102 with no password and we can use this
user to access our database called "cs2102"
deleted random file