FIX: Fix ImageMath CLP loading in slicer/prometheus
FIX: Fix ImageMath CLP loading in slicer/prometheus

Loading ImageMath in Slicer as an exec was causing it to crash (Debug mode,
in Release the module is ignored). The use of the character '<' created
mismatching tag in the xml.

Change-Id: Ic3424eadf36594708008cc92938455d84d121b9f

sumedhasingla/TubeTK,cdeepakroy/TubeTK,KitwareMedical/TubeTK,aylward/ITKTubeTK,KitwareMedical/TubeTK,KitwareMedical/TubeTK,sumedhasingla/TubeTK,cdeepakroy/TubeTK,matthieuheitz/TubeTK,LucasGandel/TubeTK,aylward/ITKTubeTK,aylward/ITKTubeTK,LucasGandel/TubeTK,aylward/ITKTubeTK,KitwareMedical/ITKTubeTK,cdeepakroy/TubeTK,matthieuheitz/TubeTK,LucasGandel/TubeTK,LucasGandel/TubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,sumedhasingla/TubeTK,matthieuheitz/TubeTK,sumedhasingla/TubeTK,cdeepakroy/TubeTK,thewtex/TubeTK,thewtex/TubeTK,thewtex/TubeTK