Fixed warnings related to return types.
updated install_codecs.sh
Merge pull request #140 from jvcleave/bugfix-gstreamer-install-dependencies

updated install_codecs.sh
Merge pull request #145 from openFrameworks-RaspberryPi/fix-warnings-ofAppEGLWindow

Fixed warnings related to return types.
Merge remote-tracking branch 'upstream/develop-raspberrypi' into develop-raspberrypi

Conflicts:
	libs/openFrameworks/app/ofAppGlutWindow.cpp

resolving merging conflicts ofAppGlutWindows
Merge remote-tracking branch 'upstream/develop-raspberrypi' into develop-raspberrypi

Conflicts:
	libs/openFrameworks/app/ofAppGlutWindow.cpp
Merge branch 'develop-raspberrypi' of https://github.com/kalwalt/openFrameworks into develop-raspberrypi

Conflicts:
	libs/openFrameworks/app/ofAppGlutWindow.cpp