[split] Error handling ( CodeIgniter 3.1.1 Released)

Big thanks for this releas

I want to ask for some future changes for CI framework.

01 show_404() display custom 404 page.
02 Custom CSRF error page.

Mainly easy implimentation of custom error pages. without extending security class. or over ride default error views.

03 this type pagination implimentation. I think its really good to show how many pages avilable.
<img src="http://image.prntscr.com/image/c924d17b15374308acc9bc4adb54e4c1.png">

Sorry for bad language skills.