adding the Brief descriptor, associated hamming distance functors for bruteforce matching.  Also adding cout << cv::Mat functions in core.

switched from 8-point kernel to 7-point kernel in the fundamental matrix estimator (fixes some corner cases; see ticket #434)

warp-affine                     //ticket 572
warp-perspective            //ticket 575
segmentation-grabcut    //ticket 666
_3d-fundam                     //ticket 434
posit                               //ticket 430

increased number of points in optflow-estimate-rigid test, because in the presense of noise there should be enough points for robust transform estimation

fixed grabCut: moved to double precision and added the noise to avoid zero determinant of covariance matrix

changing the names of the opencv libraries for android, all except 3rd parties have opencv_ prepended