config does not require 'keys.' prefix

Kohana's config reader will recognise the 'keys.' prefix based on the config file's name. Kohana::$config->load('keys') would load this file and Kohana::$config->load('keys.default_format') would load only the default_format value of this config file
Merge pull request #1 from happyDemon/patch-1

config does not require 'keys.' prefix