Added namespacing

In trying to write classes to extend SimpleImage, I found it easier to set proper namespace conventions. The class name Obj was arbitrary since I didn't want to get into pulling it appart to make a constructor class and function classes. The folder name "classes/" was also arbitrary. This would be whatever directory developers stor their classes in.

Anyhow, this sets up SimpleImage so that a) it conforms to proper namespaces, b) is thus easier to __autoload with all your other classes and c) easier to extend.