* Added checks for width, height and depth <= 0.
* Added checks for width, height and depth <= 0.


DentonW/DevIL,bcampbell/DevIL,bcampbell/DevIL,Agadoul/DevIL,Agadoul/DevIL,DentonW/DevIL,bcampbell/DevIL,Agadoul/DevIL,DentonW/DevIL,DentonW/DevIL,DentonW/DevIL,bcampbell/DevIL,bcampbell/DevIL,bcampbell/DevIL,Agadoul/DevIL,Agadoul/DevIL,Agadoul/DevIL,DentonW/DevIL