ENH: ELASTIX-1 Add fixture test example

Testing/Unit/itkRegistration.cxx

+#include "itkImage.h"
+#include "itkImageFileReader.h"
+#include "elxDataManager.h"
+#include "gtest/gtest.h"
+
+class itkRegistration : public ::testing::Test {
+public:
+  virtual void SetUp()
+  {
+    DataManager dataManager;
+    typedef itk::ImageFileReader< ImageType > ReaderType;
+
+    ReaderType::Pointer reader = ReaderType::New();
+    reader->SetFileName( dataManager.GetInput( "BrainProtonDensitySliceR10X13Y17.png" ) );
+    inputImage = reader->GetOutput();
+
+    reader->SetFileName( dataManager.GetBaseline( "BrainProtonDensitySlice.png" ) );
+    baselineImage = reader->GetOutput();
+  }
+
+  typedef itk::Image< unsigned int, 2 > ImageType;
+  ImageType::Pointer inputImage;
+  ImageType::Pointer baselineImage;
+};
+
+TEST_F( itkRegistration, Affine2D )
+{
+  ASSERT_TRUE( true );
+}