Fix memory management of imageNd.
Fix constness of vpp::copy.
Test imageNd move semantics.
Update pyrlk test.
Fix alignment in FAST openmp directives.
A default feature parameter for keypoint_container::add. Fix a bug in keypoint_container::move.
Normalize the gradient descent step in then lucas kanade matching. Re-enable openmp in Pyrlk.
Add draw.hh for drawing line2d and 3x3 squares, and colorspace_conversions.hh with rgb <-> grayscale conversions.