Copy ctkTest.h in installed files

Closes #162

Libs/Testing/CMakeLists.txt

@@ -3,3 +3,7 @@ project(CTKTesting)
 # CMake Macros
 include(CMake/ctkMacroGenerateMocs.cmake)
 
+install(FILES
+  ctkTest.h
+  DESTINATION ${CTK_INSTALL_INCLUDE_DIR} COMPONENT Development
+)