Add support for more spec-conforming TMS tilers.
Fix Sandcastle regression

`Sandcastle.addToolbarMenu` will make the first option a default if it has an `onselect` function and a default action is not already set.

This fixes a problem with the billboards and label examples where they were manually calling the first command and then it would get reset at the end of loading.
Merge pull request #1986 from AnalyticalGraphicsInc/fix-sandcastle

Fix Sandcastle regression
Fix whitespace
Merge pull request #1983 from AnalyticalGraphicsInc/tms

Add support for more spec-conforming TMS tilers.
Fix CZML Sandcastle example to work standalone.

The script tag was in the wrong place so I just had to resave it.
Merge pull request #1990 from AnalyticalGraphicsInc/fix-sandcastle

Fix CZML Sandcastle example to work standalone.
Merge remote-tracking branch 'agi/master' into quantizedMeshExtensions