move cuda output from build/.../.cuo -> build/cuda/.../.o
move cuda output from build/.../.cuo -> build/cuda/.../.o

This will allow nvcc's -M dependency generation option to work
harmoniously, since it assumes that output will have a .o extension.

longjon/caffe,tackgeun/caffe,CZCV/s-dilation-caffe,CZCV/s-dilation-caffe,longjon/caffe,gogartom/caffe-textmaps,gnina/gnina,longjon/caffe,tackgeun/caffe,gnina/gnina,CZCV/s-dilation-caffe,gogartom/caffe-textmaps,gogartom/caffe-textmaps,gnina/gnina,wangg12/caffe,wangg12/caffe,CZCV/s-dilation-caffe,gnina/gnina,gogartom/caffe-textmaps,wangg12/caffe,wangg12/caffe,tackgeun/caffe,longjon/caffe,gnina/gnina,gnina/gnina,tackgeun/caffe