LabelNode: add ref_ptr to internal _geode member
Capabilities: fixed a typo
Registry: disable the Registry-wide StateSetCache for OSG < 3.1.4, due to the lack of a mutex around Uniform::add/removeParent in OSG.
Annotation: reworked the decluttering setup to make better use of statesets. Moved the fading uniform into the Decluttering render bin. Added a ref_ptr on the geode in LabelNode.
Decluttering: incorporate fading directly
Merge branch 'master' of github.com:gwaldron/osgearth
GeometryFactory: make all methods const.
Add normal computation for polygons
Modified elevation query to use the same interpolation method as the map.
Geometry: remove abstractness so you can create an "unknown type" geometry
Label: add a new ctor
AnnotationUtils: add more ellipsoid/sphere generation options
LocalGeometryNode: fix a gcc compile issue
Merge pull request #275 from aurelien35/BugFix_ElevationQuery_InterpolationMethod

Modified elevation query to use the same interpolation method as the map.
Style: update Symbol classes with META_Symbol; update Style to hold only one symbol of each type.
OverlayDecorator: remove the "visible bounding PH" cutting step altogether. Not enough benefit for the performance price. This will also open the door to bin-based overlay/clamping since we no longer care about the bounds of the subgraph.
'HBox
Merge branch 'master' of github.com:gwaldron/osgearth
Merge pull request #276 from JohnDr/master

HBox and LabelControl fixed width
ClampingTechnique: changed the approach to culling geometry beyond the visible horizon; fixes some issues with overdraw, unwanted clamping, and horizon artifacts.