COMP: Fix ITK TestExternal build with CMake < 2.8.4
COMP: Fix ITK TestExternal build with CMake < 2.8.4

The FindITK module that comes with CMake versions prior to 2.8.4 cannot
find ITKConfig.cmake in the modularized install location under a prefix.
The FindITK module that comes with CMake 2.8.4 and later is just a thin
wrapper around find_package()'s config mode.  Use the config mode
directly to find ITK so that it works with any CMake 2.8 version.

Kitware/ITK,wkjeong/ITK,stnava/ITK,cpatrick/ITK-RemoteIO,fuentesdt/InsightToolkit-dev,jmerkow/ITK,LucasGandel/ITK,zachary-williamson/ITK,Kitware/ITK,thewtex/ITK,rhgong/itk-with-dom,InsightSoftwareConsortium/ITK,cpatrick/ITK-RemoteIO,jmerkow/ITK,hendradarwin/ITK,rhgong/itk-with-dom,paulnovo/ITK,biotrump/ITK,LucHermitte/ITK,CapeDrew/DCMTK-ITK,CapeDrew/DCMTK-ITK,hendradarwin/ITK,spinicist/ITK,wkjeong/ITK,fuentesdt/InsightToolkit-dev,heimdali/ITK,BRAINSia/ITK,malaterre/ITK,heimdali/ITK,richardbeare/ITK,atsnyder/ITK,blowekamp/ITK,vfonov/ITK,BlueBrain/ITK,ajjl/ITK,malaterre/ITK,fuentesdt/InsightToolkit-dev,eile/ITK,paulnovo/ITK,cpatrick/ITK-RemoteIO,stnava/ITK,hinerm/ITK,jmerkow/ITK,fbudin69500/ITK,CapeDrew/DITK,CapeDrew/DCMTK-ITK,wkjeong/ITK,atsnyder/ITK,zachary-williamson/ITK,msmolens/ITK,fbudin69500/ITK,paulnovo/ITK,richardbeare/ITK,CapeDrew/DCMTK-ITK,msmolens/ITK,jmerkow/ITK,msmolens/ITK,CapeDrew/DITK,jcfr/ITK,LucHermitte/ITK,BlueBrain/ITK,biotrump/ITK,eile/ITK,BRAINSia/ITK,PlutoniumHeart/ITK,blowekamp/ITK,hinerm/ITK,rhgong/itk-with-dom,msmolens/ITK,hinerm/ITK,stnava/ITK,hjmjohnson/ITK,thewtex/ITK,jcfr/ITK,wkjeong/ITK,PlutoniumHeart/ITK,fbudin69500/ITK,heimdali/ITK,GEHC-Surgery/ITK,thewtex/ITK,itkvideo/ITK,hendradarwin/ITK,heimdali/ITK,GEHC-Surgery/ITK,itkvideo/ITK,InsightSoftwareConsortium/ITK,GEHC-Surgery/ITK,richardbeare/ITK,CapeDrew/DITK,jcfr/ITK,atsnyder/ITK,LucasGandel/ITK,malaterre/ITK,itkvideo/ITK,heimdali/ITK,zachary-williamson/ITK,rhgong/itk-with-dom,BRAINSia/ITK,jcfr/ITK,fuentesdt/InsightToolkit-dev,InsightSoftwareConsortium/ITK,Kitware/ITK,itkvideo/ITK,hendradarwin/ITK,PlutoniumHeart/ITK,eile/ITK,zachary-williamson/ITK,BlueBrain/ITK,rhgong/itk-with-dom,thewtex/ITK,fedral/ITK,zachary-williamson/ITK,richardbeare/ITK,biotrump/ITK,stnava/ITK,hjmjohnson/ITK,hendradarwin/ITK,GEHC-Surgery/ITK,paulnovo/ITK,ajjl/ITK,LucHermitte/ITK,fbudin69500/ITK,fedral/ITK,richardbeare/ITK,wkjeong/ITK,ajjl/ITK,ajjl/ITK,eile/ITK,zachary-williamson/ITK,GEHC-Surgery/ITK,fedral/ITK,spinicist/ITK,CapeDrew/DCMTK-ITK,ajjl/ITK,hinerm/ITK,jcfr/ITK,vfonov/ITK,zachary-williamson/ITK,hinerm/ITK,jcfr/ITK,hendradarwin/ITK,ajjl/ITK,LucasGandel/ITK,paulnovo/ITK,fedral/ITK,cpatrick/ITK-RemoteIO,vfonov/ITK,eile/ITK,biotrump/ITK,rhgong/itk-with-dom,vfonov/ITK,LucasGandel/ITK,LucasGandel/ITK,spinicist/ITK,LucasGandel/ITK,cpatrick/ITK-RemoteIO,paulnovo/ITK,biotrump/ITK,stnava/ITK,Kitware/ITK,rhgong/itk-with-dom,stnava/ITK,vfonov/ITK,thewtex/ITK,BlueBrain/ITK,CapeDrew/DITK,eile/ITK,CapeDrew/DITK,rhgong/itk-with-dom,vfonov/ITK,Kitware/ITK,heimdali/ITK,malaterre/ITK,LucHermitte/ITK,blowekamp/ITK,fbudin69500/ITK,LucasGandel/ITK,Kitware/ITK,msmolens/ITK,cpatrick/ITK-RemoteIO,msmolens/ITK,fuentesdt/InsightToolkit-dev,GEHC-Surgery/ITK,vfonov/ITK,biotrump/ITK,malaterre/ITK,GEHC-Surgery/ITK,spinicist/ITK,biotrump/ITK,msmolens/ITK,blowekamp/ITK,fedral/ITK,jcfr/ITK,hendradarwin/ITK,heimdali/ITK,LucHermitte/ITK,fuentesdt/InsightToolkit-dev,atsnyder/ITK,GEHC-Surgery/ITK,hinerm/ITK,stnava/ITK,blowekamp/ITK,hinerm/ITK,wkjeong/ITK,hjmjohnson/ITK,richardbeare/ITK,CapeDrew/DCMTK-ITK,BRAINSia/ITK,BlueBrain/ITK,jmerkow/ITK,vfonov/ITK,vfonov/ITK,msmolens/ITK,spinicist/ITK,paulnovo/ITK,eile/ITK,hjmjohnson/ITK,hinerm/ITK,spinicist/ITK,ajjl/ITK,itkvideo/ITK,fbudin69500/ITK,itkvideo/ITK,malaterre/ITK,atsnyder/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,BlueBrain/ITK,blowekamp/ITK,ajjl/ITK,LucHermitte/ITK,PlutoniumHeart/ITK,LucasGandel/ITK,itkvideo/ITK,jmerkow/ITK,hjmjohnson/ITK,blowekamp/ITK,thewtex/ITK,hendradarwin/ITK,hinerm/ITK,spinicist/ITK,wkjeong/ITK,BRAINSia/ITK,itkvideo/ITK,spinicist/ITK,BRAINSia/ITK,heimdali/ITK,CapeDrew/DCMTK-ITK,jmerkow/ITK,zachary-williamson/ITK,fuentesdt/InsightToolkit-dev,malaterre/ITK,malaterre/ITK,BRAINSia/ITK,fbudin69500/ITK,stnava/ITK,spinicist/ITK,CapeDrew/DCMTK-ITK,paulnovo/ITK,fedral/ITK,fedral/ITK,fbudin69500/ITK,cpatrick/ITK-RemoteIO,stnava/ITK,wkjeong/ITK,atsnyder/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,atsnyder/ITK,cpatrick/ITK-RemoteIO,fuentesdt/InsightToolkit-dev,hjmjohnson/ITK,jcfr/ITK,jmerkow/ITK,hjmjohnson/ITK,malaterre/ITK,Kitware/ITK,LucHermitte/ITK,fedral/ITK,CapeDrew/DITK,fuentesdt/InsightToolkit-dev,PlutoniumHeart/ITK,PlutoniumHeart/ITK,CapeDrew/DITK,CapeDrew/DITK,eile/ITK,zachary-williamson/ITK,LucHermitte/ITK,PlutoniumHeart/ITK,BlueBrain/ITK,richardbeare/ITK,CapeDrew/DITK,eile/ITK,blowekamp/ITK,atsnyder/ITK,CapeDrew/DCMTK-ITK,PlutoniumHeart/ITK,biotrump/ITK,BlueBrain/ITK,atsnyder/ITK,itkvideo/ITK