Added nxScale and nyScale params so that layer size can be scaled based on image size.
Added nxScale and nyScale params so that layer size can be scaled based on image size.

git-svn-id: 602a26e73ae9f2a14e2bb95676f2e137fcc39919@1643 7c0444ca-5550-0410-9008-faecdbe78eb5

dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV