add integral image layer
set up DenseWindowDataLayer interface
Merge branch 'master' into integral-img
add reshape for integral-img
dense window data layer setup
dense window data (Proposal only)
zero-out top data blobs
add DenseWindowDataLayer to layer factor
fix bug
fix bug in DenseWindowDataLayer
interface for DenseWindowLossLayer
Merge branch 'integral-img' into dense-window-loss
set up interface
Merge branch 'dense-window-data' into dense-window-loss

Conflicts:
	src/caffe/layer_factory.cpp
	src/caffe/proto/caffe.proto