COMP: Fix missing prefix in ITKv3ImageRegistration20Test.

For:

CMake Error at Examples/RegistrationITKv3/test/CMakeLists.txt:147
 (set_tests_properties):
 set_tests_properties Can not find test to add properties to:
   ImageRegistration20Test

Change-Id: I5e1cd656f20369ab8ae36c95f356e9a701f9e840
COMP: Allows latex to compile for ITKSoftwareGuide
Merge branch 'ImageRegistration20Test_release' into release

Change-Id: I0546b979b29d500447840a1785876402d8c50c97