Renamed Property.h header file in Geometry because it clashes with new...

Renamed Property.h header file in Geometry because it clashes with new Property header in Kernel. As far as I can tell it's not used at the moment. Re #54.

Code/Mantid/Geometry/inc/DataSpace.h

 #ifndef DataSpace_h
 #define DataSpace_h
 
-//! Impliments a simple data storage space
+// Impliments a simple data storage space
 
 namespace Mantid
 {