Started scene loading. Cameras and model loops mostly complete. However...

Started scene loading. Cameras and model loops mostly complete. However uncommented since its not loading correctly.

docs/scene.example.yml

@@ -15,7 +15,7 @@ camera: maincam
 # Define entities from bottom up
 # Childrens first, then parents
 
-entity: 4
+entities: 4
 
 entity: childCube
   model: cube

include/overkill/Scene.hpp

@@ -6,6 +6,9 @@
 #include <overkill/Config.hpp>
 #include <overkill/EntityModel.hpp>
 #include <overkill/EntityCamera.hpp>
+#include <overkill/Parser.hpp>
+#include <overkill/Util.hpp>
+
 
 namespace overkill 
 {