Several Changes

- added base url in config. use this to redirect to different
controllers
- added login page
- added login and logout functionality
- only display login and signup buttons if user is not logged in
- only display my account if user is logged in
- added user controller and user model
- created custom form validation file
- added in schema change to add password into user table
- allow all log messages to be printed
Merge branch 'master' of https://github.com/gswetha/cs2102

Conflicts:
	application/controllers/home.php
	application/views/user_home_page.php