First pass at a `clock` object.
Changes after review.
Update Java.
Merge pull request #46 from AnalyticalGraphicsInc/clock

Document level clock definition...
Merge pull request #45 from cmorse/master

Add GetId from kml document element, and generate if it does not exist
Add support for a grid material.
Update Java translation.
Merge pull request #47 from AnalyticalGraphicsInc/gridMaterial

Add support for a grid material.