Added WCS DescribeCoverage document parsing.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2061 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Modified WCS DescribeParsing code to handle and test nativeCRSs element correctly.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2062 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Added a method to ShapeDataCache that supports reducing a cache entry's remaining expiration time when the eye distance changes.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2065 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Added creation of elevation model from WCS capabilities and describe-coverage documents.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2066 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Added the ShapefileRenderable abstract base class and an implementation for shapefiles with extruded polygons. See WWJ-524.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2067 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Added a method on Shapefile that returns the record attribute names, if any. Added a Shapefile utility method that returns whether or not a Shapefile's records have a height attribute.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2068 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Integrated ShapefileExtrudedPolygons into the Shapefiles example. See WWJ-524.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind@2069 822214bb-dcf7-4c8d-a767-17ae0fb20d88
Merge branch 'official' into worldwind-sdk