.gitignore file for CodeIgniter 3

Hi there,

Is the following .gitignore file published in https://github.com/github/gitignore/blob....gitignore an acceptable one?

*/config/development
*/logs/log-*.php
!*/logs/index.html
*/cache/*
!*/cache/index.html
!*/cache/.htaccess

I've received the advice that I should include the user_guide and system directory in case I want to update CodeIgniter in the future. Also the application/config directory because contains plataform specific files. What is your advice about the .gitignore file?