ImageUtils: add support for r dimension
Allow text-provider to be something other than "annotation" if it's set.
Sky: ambient, date; docs update
Merge branch 'master' of github.com:gwaldron/osgearth
Added support for multi-dimensional image binding in MP
Virtual dtor for DepthOffsetInterface
When Profile::createTileKey(), use unsigned to allow for more LOD and also check for overflow condition. Take care of some other signed/unsigned issues and a method that should return something in one case.
Merge pull request #471 from Thomas-Lerman/lerman-extent

When Profile::createTileKey(), use unsigned to allow for more LOD and al...
Merge pull request #470 from dsallen/topic-custom-annotation

Allow text-provider to be something other than "annotation" if it's set.
Merge branch 'master' of https://github.com/gwaldron/osgearth into Optimize_ImageLayer