Merge branch 'master', remote branch 'origin'
Merge remote branch 'pierre/master'
orientation assignment is wrong
work in collaborative reading from central memory
merged branches
merge conflicts
non working
Merge branch 'master', remote branch 'origin'
working image.cl
better compliance with AMD_OCL
copy Device -> Host only valid keypoints
Merge remote branch 'pierre/master'

Conflicts:
	openCL/image.cl
	sift-src/plan.py
correct tests
non working
working code (needs cleaning)
optimization of orientation assignment
integrate keypoints descriptors
many attempts to get smth workin but inefficient
Merge remote-tracking branch 'pierre/master'

Conflicts:
	openCL/keypoints.cl
	sift-src/plan.py
small optimizations