added edit page
added admin table
made username & token unique
added static url function
added backend login
added site_url function
added <form> to login form validation error page
added backend page
added backend page
added auth controller
fixed $this in non-object context
added backend/tutor page
Merge branch 'pr/3' into dev/backend
Merge branch 'pr/4' into dev/backend
bind tutor edit & create page
remove tutor and update edit_tutor
added submit link
added load content
provided form
Merge branch 'pr/5' into dev/backend

Conflicts:
	application/controllers/backend/tutor.php
	application/models/tutor_model.php