Update to C++ 11/14/17

Algorithms/itkAddGaussianNoiseImageFilter.h

Algorithms/itkAddGaussianNoiseImageFilter.txx

Algorithms/itkFiberBundleStatisticsCalculator.cxx

Algorithms/itkFiberBundleStatisticsCalculator.h

Algorithms/itkGradientMagnitudeTensorImageFilter.h

Algorithms/itkGradientMagnitudeTensorImageFilter.txx

Algorithms/itkRemoveNonPositiveTensorsTensorImageFilter.h

Algorithms/itkRemoveNonPositiveTensorsTensorImageFilter.txx

Commands/itkAddGaussianNoiseToImageCommand.cxx

Commands/itkAddGaussianNoiseToImageCommandFactory.cxx

Commands/itkAddGaussianNoiseToImageCommandFactory.h

Commands/itkAddGaussianNoiseToTensorsCommand.cxx

Commands/itkAddGaussianNoiseToTensorsCommandFactory.cxx

Commands/itkAddGaussianNoiseToTensorsCommandFactory.h

Commands/itkAddRicianNoiseToImageCommand.cxx

Commands/itkAddRicianNoiseToImageCommandFactory.cxx

Commands/itkAddRicianNoiseToImageCommandFactory.h

Commands/itkApplyMaskToImageCommand.cxx

Commands/itkApplyMaskToImageCommandFactory.cxx

Commands/itkApplyMaskToImageCommandFactory.h