Unified cache driver

This is the beginning of work on the unification of all calls and appeals to the driver cache.

+ Updated: Now __ACL__, __Filter__ and __Route__ will use `Cache::instance` as way to call current default cache driver. Removed in these classes `Kohana::cache` and used simply `Cache::instance()->get()->set()`. In future it will be replaced by one object `Gleez::$cache`
+ Fixed: Cleanup & added PHPDoc
+ Fixed: Minor cleanup spaces & code