updated background subtraction demo
changed VIBE parameters
test data for labeling
updated gpu demos pack

* new stitching demo
* fix background subtraction demo
updated bgfg demo
Add testdata for non-local means denoising algorithm
Add data for dense optical flow estimation : two frames and groud truth
flow estimation (from 'RubberWhale' image http://vision.middlebury.edu/flow/data/)
added templ.png image for generalizedHough tests
added caltech data
added gpu::NLM_bruteforce test data
Merge pull request #3 from urikz:master
invert colors in templ image
added test data for soft cascades
added simple softcascade example
fixed compilation (new CommandLineParser interface)
second version of soft cascade xml representation
fixed typo
Update denoising reference images
Added 1080p frames to test the registrator
added data for BRISK regression tests