Fixed bug with RawVolume always starting coordinates at (0,0,0).

Removed Filters.h/.inl
Added Summed Area Table support to LowPassFilter.
Added test for low pass filter.

library/PolyVoxCore/include/PolyVoxCore/Volume.inl

@@ -197,7 +197,6 @@ namespace PolyVox
 	uint32_t Volume<VoxelType>::calculateSizeInBytes(void)
 	{
 		return getWidth() * getHeight() * getDepth() * sizeof(VoxelType);
-	}
-
+	}	
 }