Docs update.
Added missing QMessageBox include.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Added missing oe_Normal varying to ShaderGenerator when applying a TexGen.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Add customizable defaults for GeometryCompilerOptions
Merge branch 'master' of github.com:gwaldron/osgearth
Tweak: only apply oe_Normal in TexGen when necessary
LOD Blending: allow separate elevation and imagery blending toggles
Docs update
Add GeoTransform class; rename TerrainHeightProvider to TerrainResolver interface.
Add GeoTransform node