Made changes to relu layer so that it uses thrust. This will be more efficient than spawin one thread per neuron. It also makes this code work on smaller GPUs which otherwise throw a configuration error.
Changes to paths in imagenet so that it uses kitti dataset.
Merge branch 'boost-eigen' of https://github.com/aravindhm/caffe into boost-eigen

Conflicts:
	src/caffe/layers/flow_layer.cpp