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
Fix: draped geometry was getting cut off on the edges with the overlay resolution ratio in effect
Merge branch 'master' of github.com:gwaldron/osgearth
Fix error checking in GetGit cmakemodule
Bonehead.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Checking for obviously bad geometries in the GDAL driver.

Fixes issues with shapefiles that have obviously bad data.
Changed ModelLayerNodeMap to use a ref_ptr to avoid issues if the node gets moved around.
OD: fix a clipping bug
Merge branch 'master' of github.com:gwaldron/osgearth
Overlayviewer: add animation path support -p
AnnotationEvents: patch for OSG 3.3.1 build error (UNTESTED)
Added code in MP engine to disable mipmapping on NPOT textures.
Logging level / docs updates
Docs update: start/deps
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.