ENH: Simple MI metric evaluation

This is a simple program for mattes mutual information metric
evaluation over two input images and a BSpline transform.

If there is no input BSpline transform, the transform will be
set to Identity as the default.

The Usage:
./PerformTestMMI Image1 Image2 [BSplineTransformFile]
                 [NumberOfHistogramBins] [NumberOfSamples]
Merge pull request #82 from aghayoor/MIMetricEvalOnBSplineTrans

ENH: Simple MI metric evaluation
Update README
COMP: Fix compilation error

Clang compiler is very strict about which types can be added to ostream.
BUG: support new Philips scanner data.

Also include itkDCMTKFIleReader from ITK;
found a bug in thatclass in ITK,
so fix the bug and include the class here,
until the bug is merged in ITK proper.
BUG: support new Philips scanner data.

Also include itkDCMTKFIleReader from ITK;
found a bug in thatclass in ITK,
so fix the bug and include the class here,
until the bug is merged in ITK proper.
COMP: Synchronize Superbuild with NAMICExternalProjects
COMP: fix some CMake 3 problems
COMP: make sure SlicerExecutionModel_DIR gets passed to BRAINSTOols
COMP: fix compile failures due to BRAINSTools not finding VTK
COMP: rearrange CMakeLists.txt to accomodate CMake 3
Merge pull request #83 from Chaircrusher/ArtichokeSuperbuild

Artichoke superbuild for BRAINSTools
COMP: Update ITK version for DCMTK bug fix
Merge pull request #84 from Chaircrusher/update_ITK

COMP: Update ITK version for DCMTK bug fix
DOC: add message to DWIConvert/CMakeList.txt if ITK versionno longer needs DCMTKFileReader patch
COMP: converting to use BRAINSCommonLib functions
Merge pull request #86 from Chaircrusher/simplify_gtractTransformToDisplacementField

COMP: converting to use BRAINSCommonLib functions
COMP: The BRAINSFit.cpp file is redundant

I don't ever remember '.cpp' being the preferred C++ file suffix
and yet there's both a CXX and CPP file for BRAINSFit
Removing the CPP file (which appears older, and isn't
compiled at anyr ate.
ENH: Speedup BSpline registration part in BFit

New changes are only applied to the BSpline registration part.
Based on new changes if the output composite transform is not null, it
is applied to the moving image, and the warped moving image is passed to
the BSpline registration filter.

Used the new initialization API for BSpline reg
BUG: New baselines for 4 BFit BSpline tests