A basic couple of Utilitiy classes.

Utils/Log will allow you to write debug statements that will output to the php error log rather than the application output.

Utils/Loader a basic class auto loader that will allow developers to register their frameworks with this autoloader.
A factory class that will allow you to specify that the Cache should work through a specific driver.  Each driver is a class and since you specify the driver either as a class name (string) or a namespace (string) it will allow the extension of the cache by using drivers outside the Edify project