remove index.php file from the url
autoload custom config which is the most used and important config file
clean up, keep only the function to make sprite image
remove the index.php from config['index_page'] to keep the url clean.
add custom config value to database config file so that there is no need to make change with database file every time migrate or deploy. just need to change the value in custom config
remove captcha. Clean update the function asset->getlink
minor change