BUG: MatrixMath had unimplemented functions and namespace errors
BUG: MatrixMath had unimplemented functions and namespace errors

When porting code into MatrixMath to make it more easily re-used,
bugs were found by Mac and Linux dashboard builds.

thewtex/TubeTK,aylward/ITKTubeTK,aylward/ITKTubeTK,thewtex/TubeTK,aylward/ITKTubeTK,thewtex/TubeTK,thewtex/TubeTK,aylward/ITKTubeTK