Smartek Giganetix Cameras support (Patch #2192) integrated to master.
Update modules/contrib/include/opencv2/contrib/contrib.hpp

class LevMarqSparse is not tagged CV_EXPORTS, 
so the contrib module,  built the on win using vs won't contain that symbol,
trying to create an instance of LevMarqSparse will lead to a 'undefined symbol' err, because it did not make it into the library.
Merge pull request #413 from berak:master
Merge pull request #409 from asmorkalov:giganetix_cams_patch_master