implement gpu function of hinge rank loss layer, cpu function pass test,
gpu's not yet
	modified:   include/caffe/loss_layers.hpp
	modified:   src/caffe/layers/hinge_rank_loss_layer.cpp
	new file:   src/caffe/layers/hinge_rank_loss_layer.cu
	modified:   src/caffe/test/test_hinge_rank_loss_layer.cpp