Merge remote branch 'upstream/master'
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.
Merge branch 'master' of github.com:gwaldron/osgearth
Reverted FeatureSourceWFS back to saving the response to disk in a temp file to allow loading of GML again.
Changed getfeature to GetFeature in FeatureSourceWFS.
Merge branch 'master' of github.com:gwaldron/osgearth
Updated WCS driver to support new initialization style.
Integrated pull request #167.
Add: PolygonizeLines; Break out Stroke/Fill classes into their own files.