Add an animation to provide feedback for asynchronous CZML loading.
Different loading animation, not English-specific.  Better?
[Color] Add Color.fromCSSColor()

Support #rgb, #rrggbb, rgb() and rgba() formats
Update the changelog
[Color] fix CS
[Color] Add support for named colors & hsl[a]()
[Color] Tweaks
[Color] fix regexps
Merge pull request #402 from vicb/csscolor

[Color] Add Color.fromCSSColor(), Color.fromHSL()
Fix jshint warnings, doc tweak.
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.
Added NamedColors enumeration.
Remove unused dependency.
Merge branch 'master' into color
Fix documentation type for NamedColors.
Rename use of `toCSSColor` to `toCssColorString`. Update CHANGES.md.