forward max pooling
added max pooling to init
added ffi and function body
added backward max pooling
backward max pooling test added
nloop set to 1
test name fix
Merge pull request #13 from szagoruyko/master

Bindings for SpatialMaxPooling
doc update for spatmaxpool
added ffi prototypes
added cross response normalization (untested)
make test to old convention
a small train loop
testing spatialcrossresponsenorm
added appropriate texture destroys
Merge remote-tracking branch 'upstream/master'

Conflicts:
	init.lua