YUV working for gst + pixelFormat use for ofPixels
Merge branch 'feature-YUV' of /media/arturo/elements/openFrameworks into feature-YUV
ofGLUtils: fixes for gles
ofPixels: removed channels variable, all allocations based on pixelFormat
Merge branch 'develop' of github.com:openframeworks/openFrameworks into feature-YUV
Merge branch 'develop' of github.com:openframeworks/openFrameworks into feature-YUV

Conflicts:
	libs/openFrameworks/video/ofGstVideoGrabber.cpp
Merge branch 'master' into feature-YUV

Conflicts:
	libs/openFrameworks/graphics/ofPixels.cpp
	libs/openFrameworks/graphics/ofPixels.h
	libs/openFrameworks/utils/ofConstants.h
	libs/openFrameworks/video/ofGstUtils.cpp
	libs/openFrameworks/video/ofGstVideoPlayer.cpp
	libs/openFrameworksCompiled/project/linuxarmv6l/config.linuxarmv6l.default.mk
	libs/openFrameworksCompiled/project/makefileCommon/config.linux.common.mk
	libs/openFrameworksCompiled/project/makefileCommon/config.shared.mk
Update signal handling
- Pass user readable signal name string.
- Pass signal number as exit code w/ std::exit()
- Change global signal handler name to ofSignalHandler().
Tabs to match local code style.
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
Merge branch 'master' of https://github.com/openframeworks/openFrameworks
add mat3 uniform setter in ofShader
add note recommending 4x4 mat for shader uniform
Merge branch 'master' into feature-shader-uniform-mat3
Merge branch 'master' into feature-shader-uniform-mat3

Conflicts:
	libs/openFrameworks/gl/ofShader.h
directly access ofMatrix3x3 member when setting uniform