Initial Windows RT support commit.
GPU module turned off;
TIFF support turned off;
Windows Managment and Video IO (VFW) turned off.
Multiple Windows RT fixes

TIFF build was fixed;
Direct Show back-end was enabled;
More accurate guards implemented.
More accurate guards for WinRT features in CMake.
Highgui tests for GUI disabled for WinRT;
Warnings fix;
added tutorial by Wolf Kienzle on using "image watch" plugin for ms visual studio
enabled png and jpeg for iOS
Merge pull request #697 from Nerei/ios_png_jpeg

Enabled png and jpeg for iOS
Merge pull request #698 from vpisarev/ms_visimage_tut24

added tutorial by Wolf Kienzle on using "image watch" plugin for ms visual studio
CPU implementation of CLAHE
GPU implementation of CLAHE
Merge pull request #701 from jet47:clahe
Drop outdated targets and fix solution folders
fix amdFft and amdBlas path
Add a macro to call additional barrier function on the fly
discard comments in kernels.cpp
fix some mismatch
more fix of mismatch functions on CPU OCL
more fix of mismatch
more fix
Add a function to query ocl device info

Currently the function only supports wavefront size query