added script to build the universal opencv2.framework for iOS device and simulator. fixed opencv_world cmake script to create static libopencv_world.a for iOS. temporarily disable compressed file storages in the case of iOS (to avoid dependency of zlib)

fixed 2 build problems on MacOSX (highgui with ffmpeg, opencv_world); added macro CV_INIT_ALGORITHM for simpler algorithm registration (ticket #1876)

Shortened CMake script for opencv_world. Fixed opencv_world link with non-Visual Studio generators on Windows.

added opencv_world module that combines all the other [selected by user] OpenCV modules, except for opencv_python and opencv_gpu.