Added circle detector based on Hough transform.
Added sample output of HoughCircles on img/cam.jpg.
Filtering the results by min and max diameter (input parameters).
Merge pull request #5 from simonfojtu/master

Circle detector based on Hough transform
formatting
Merge remote-tracking branch 'refs/remotes/origin/master'
release 0.10.7; Thank you, Simon for Hough stage!