Fix a bug of retinaParameters.
When colorMode is set to 0 via Retina::_init method, _retinaParameters's
colorMode variable is not correctly assigned.
Merge pull request #4 from Itseez/2.4

OpenCV changes
Fix bilateralFilter function
Make some tweaks to make `sum` operations less frequently
Fix build error.
Remove trailing whitespace.
rewrite gpu stereo multi gpu sample:

* use different approaches -> threads and streams
* clean up code
fixed building OpenCV with IPP 6.x (different DFT API); added Canny and rectangular morphology (based on Alex Kapustin patches)
LibTIFF Win32 API back-end disabled for Windows RT.
/apicontainer added to linker flags on WinRT to fix api test issues.
fixed bugs in rectangular morphology case
Add IPP support in compare function
Merge pull request #1359 from asmorkalov:winrt_tiff_api_fix
Merge pull request #1361 from asmorkalov:winrt_api_container
gpu -> ocl
enabled some tests that failed before OCL_TEST_CYCLE*() macroses were defined and for some tests was disabled SANITY_CHECK, because plain and ocl results must not be completely equal
Merge pull request #5 from Itseez/2.4

Some changes in OpenCV
Add IPP support in meanStdDev, minMaxIdx, norm functions
Merge pull request #1370 from ilya-lavrenov:ocl_decor
Merge pull request #1363 from ilya-lavrenov:ocl_enable_tests