Added some debug traces

git-svn-id: http://find-object.googlecode.com/svn/trunk/find_object@410 620bd6b2-0a58-f614-fd9a-1bd335dccda9
Added BruteForce nearest neighbor (with GPU option), which is now the default for binary descriptors
CMake: Detecting if openCV is built with nonfree module, if yes, SIFT and SURF can be used

git-svn-id: http://find-object.googlecode.com/svn/trunk/find_object@411 620bd6b2-0a58-f614-fd9a-1bd335dccda9