remove maptiler generated htmls, remove default credit, use getNumberOfYTilesAtLevel, allow user defined tiling scheme
Add an animation to provide feedback for asynchronous CZML loading.
Different loading animation, not English-specific.  Better?
Code review
adding XML parsing to TMS
update to latest master
Initial implementation of `JulianDate.toIso8601`.

1. Also add `JulianDate.toGregorianDate` which returns a new data structure.
2. Add `sprintf` function via third-part code.
3. Still needs clean up, doc, and LICENSE.MD changes.
Add doc to new JulianDate methods.
Fixes for Ellipsoid.scaleToGeodeticSurface

1. Handle case where cartesian is at or near the center of the ellipsoid.
2. For positions at the center, we now return `undefined`.
3. For positions near the center, we now return the result instead of getting stuck in an infinite loop.
4. Fixes #338 by handling case 2 during a morph.
5. Minor cleanup related to above changes.

CC @kring @bagnell
Update licensing.
Update CHANGES.
Small fixes to date logic in the Timeline demo app
Minor doc improvements
Fix tilt close to surface in 3D. There is still the problem with zooming out when in columbus view.
Add category support for specs.
Merge remote-tracking branch 'origin/master' into toIso8601

Conflicts:
	CHANGES.md
Fix TimelineDemo.
Update Timeline.makeLabel to use new JulianDate.toGregorianDate() function.

This fixes, at long last, the Timeline's inability to properly display
leap seconds.  The horizontal space was correct before, but not the labeling.
Now you can find labels like `Jun 30 2012 11:59:60` on the timeline.
Add category support for suites.
Count categorized suites as focused.