More work on RenderableVolumeExpert

- Added include directory support
- Added definitions support
- Added a volume helpers
- Fixed errors in kameleon wrapper
- Added ENLIL support in kameleonwrapper

include/openspace/util/kameleonwrapper.h

@@ -49,6 +49,7 @@ public:
 
 private:
 	ccmc::Model* _model;
+    Model _type;
 	ccmc::Interpolator* _interpolator;
 };