Add normal computation for polygons
added some convenience values to altitudesymbol; fixed the multilod sample color
Sky: add automatic ambience for better day/night lighting
VBOS: tied default DL usage to a Capabilities setting. No functional change at this time.
Added partial ios documentation for testing purposes.
Docs update: working on iOS notes.
Update docs/source/startup.rst
Morphing experiments
SpatialReference docs
Merge branch 'master' of github.com:gwaldron/osgearth
docs: add
Docs: updated iOS docs
Merge branch 'master' of https://github.com/gwaldron/osgearth
docs: fixed formatting
FIX: createUniformForGLMode busted in ShaderFactory (tx WalkingCat)
Merge branch 'master' of github.com:gwaldron/osgearth
Removed problematic calls to recalculateCenter()
Merge pull request #287 from flyncode/master

RETRY:  Remove calls to recalculateCenter()
Merged PR#278 Topic gles ios
Merge branch 'master' of https://github.com/gwaldron/osgearth