Sync with Jerome
Use descriptor_844 if CC<2.0
Working descriptors with atomic add
Working descriptors with atomic add
passing device counter in descriptor kernel, instead of keypoints_end
Matching on GPU seems to work
Matching on GPU seems to work
optimizing matching on gpu
Merge remote branch 'pierre/master'

Conflicts:
	openCL/image.cl
	openCL/keypoints.cl
	openCL/reductions.cl
	sift-src/plan.py
	test/crash.py
	test/profile.py
	test/test_algebra.py
	test/test_image_setup.py
split file for kernel optimized either for CPU/GPU
test multiple kernels
compatiblity with former imageAlignment