lot's of changes; nonfree & photo modules added; SIFT & SURF -> nonfree module; Inpainting -> photo; refactored features2d (ORB is still failing tests), optimized brute-force matcher and made it non-template.

 [~] Automatically tracked dependencies between modules
 [+] Support for optional module dependencies
 [+] Options to choose modules to build
 [~] Removed hardcoded modules lists from OpenCVConfig.cmake, opencv.pc and OpenCV.mk
 [+] Added COMPONENTS support for FIND_PACKAGE(OpenCV)
 [~] haartraining and traincascade are moved outside of modules folder since they aren't the modules

[~] fixed warning in featuers2d under windows (can't generate assignment operator)

2) NVidia tests for GPU
3) FD sample that uses NVidia's interface.

fixed TargetArchs implementation in case when HAVE_CUDA=false, added initial structure for multi_gpu sample

2) added mask support to device 'transform' function 
3) sample hog gpu: waitKey(1) -> waitKey(3), in other case image is not displayed.

removed keypoint_matching.cpp from samples/cpp/CMakeLists.txt, fixed some crashes in select3dobj.cpp