[IGSTK-Developers] classname inconsistency

[Julien Jomier]

Hello,

Sorry for the flow of emails...

I think we should rename the ImageSpatialObject classes to be 
ImageObject for consistency between classes in igstk. The main reason is 
that most of the object classes are following this convention, i.e 
igstkBoxObject, etc...

Also, when referring to a SpatialObject I always think about the ITK 
one, which can be confusing.

Let me know what you think,

Julien