Add an offset to the grid material.
Merge remote-tracking branch 'origin/master' into grid-offset
CHANGES.md
Merge remote-tracking branch 'origin/master' into grid-offset
Fix typo in vertexPositions cartographicRadians processing

Also add unit tests.
Fix typos
Merge branch 'master' into grid-offset

Conflicts:
	CHANGES.md
Merge pull request #1634 from AnalyticalGraphicsInc/grid-offset

Grid offset
Merge pull request #1662 from AnalyticalGraphicsInc/czml-cartographicRadians

Fix typo in vertexPositions cartographicRadians processing
In order to request content, we need an absolute URI.  If the input URI is protocol-relative, use "http".
Merge pull request #1667 from AnalyticalGraphicsInc/fixProtocolRelativeProxyUrls

Fix protocol-relative URIs in development proxy.
Fix scissor test spec.
Fix failing billboard collection test on HD 4000.
Merge pull request #1669 from AnalyticalGraphicsInc/scissorTestSpec

Fix failing tests on HD 4000
Tweak CHANGES.md for b28
Updated build.xml for b28
Fix doc
Don't refine tiles past our available data.

If a tile's geometry was created by upsampling its parent, and all of its
TileImagery instances are adopted from its parent as well, mark the tile
as UPSAMPLED_ONLY.  When selecting tiles to render, don't refine a parent
tile when all of that tile's children are marked UPSAMPLED_ONLY, because
it's just extra draw commands and GPU work with no benefit.

This reduces the number of tiles rendered in the Half Dome view in the Terrain
Sandcastle example from 243 to 219, which is still way too many.  Other
views are unaffected because they're not close enough to exceed available
data.
Cleanup, CHANGES.md, add a test, fix a test.
Past tense.