Update CHANGES with CZML information.
Fix typos and reword some things.
Merge pull request #2014 from AnalyticalGraphicsInc/czml-changes

Update CHANGES with CZML information.
Fix typo.
Clean up CHANGES.
Remove empty CSS class declaration.
Bump version to 1.0.
Fix #2015

* Billboard was missing a check to ignore calls to set it equal to the value it already was.
Merge pull request #2016 from AnalyticalGraphicsInc/fixBillboardImage

Fix #2015
Fix typo causing globe surface shader recompile every frame.
Merge pull request #2018 from AnalyticalGraphicsInc/fixGlobeShaderInvalidation

Fix typo causing globe surface shader recompile every frame.