BUG: Use GTest for ITK>=4.13

Google test was just added during ITK 4.13 development. The logic is
corrected.

Author: blowekamp

itk-module.cmake

@@ -10,7 +10,7 @@ file(READ "${MY_CURRENT_DIR}/README.rst" DOCUMENTATION)
 # By convention those modules outside of ITK are not prefixed with
 # ITK.
 
-if( NOT "${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}" VERSION_LESS "4.12" )
+if( NOT "${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}" VERSION_LESS "4.13" )
   set(_GoogleTest_DEPENDS ITKGoogleTest)
 endif()
 

test/CMakeLists.txt

@@ -251,7 +251,7 @@ itk_add_test(NAME itkFirstOrderTextureFeaturesImageFilterTest1
           5
       )
 
-if( NOT "${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}" VERSION_LESS "4.12" )
+if( NOT "${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}" VERSION_LESS "4.13" )
   set(TextureFeaturesGTests
     itkFirstOrderTextureFeaturesImageFilterGTest.cxx
     )