Stetch support for Android View classes added (Feature #2840)
Fix build errors
gpu : implement Bayer* -> Gray color conversion
Merge pull request #635 from taka-no-me:c++11
Fix clang + ccache build warnings
Merge pull request #630 from asmorkalov:android_view_stretch
Merge pull request #633 from jet47:gpu-debayer-gray
Merge remote-tracking branch 'upstream/2.4' into 2.4