Changed CMake files and #includes to allow Qt5 while still being backwards compatible with Qt4. Add Qt5 (qtbase) directory to CMAKE_PREFIX_PATH to use Qt5.
Qt5OpenGL includes were not included correctly
Merge branch 'master' of git://github.com/gwaldron/osgearth
SingleThreaded Qt
Merge branch 'master' of https://github.com/rooi/osgearth into rooi-master

Conflicts:
	src/applications/CMakeLists.txt
	src/osgEarthDrivers/wcs/WCS11Source.cpp
	src/osgEarthQt/MultiViewerWidget
	src/osgEarthQt/MultiViewerWidget.cpp
	tests/feature_geom.earth
	tests/shadows.earth
More Qt5 updates.