docs update.
Added DateTime::asRFC1123
Cleaned up the FileSystemCache so it does not create empty directories; worked on the TMS expiration mechanism
Fix last-modified time retrieval in HTTPClient
Added a label to osgearth_manip
osgearth_manip
Fixed precision issue in getWorldCoordsUnderMouse

Converted getWorldCoordsUnderMouse to use our DPLineSegmentIntersector
to avoid precision issues.
Controls: fix error in the label shader code
Merge branch 'master' of github.com:gwaldron/osgearth
Removed files accidentally committed.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Fixed coordinate display in osgearth_elevation example.
Fixed AddPointHandler to work in any coordinate system, not just geocentric.
Annotation: createEllipsoid 3 axis support
Merge branch 'master' of github.com:gwaldron/osgearth
Fix: ElevationLayerVector::getHeightField was not properly falling back when isKeyValid=false, resulting in zero-elevation tiles appearing when the imagery LOD exceeded the elevation max LOD.
Multi-threaded TMS packager.
Multi-threaded TMS packager improvements.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Fix for build error.