Fix CZML cartographicDegrees and add specs.

Fixes #1094
Merge pull request #1074 from abwood/issue93

Scale billboards based on distance (Issue #93)
Added Alex Wood to CONTRIBUTORS.md
Reorg CHANGES.md
Add front and back face passes for translucent, closed geometry.
Update Sandcastle example.
Add test for rendering primitive in two passes.
Merge pull request #1095 from AnalyticalGraphicsInc/issue1094

Fix CZML cartographicDegrees and add specs.
Work around more Android uniform weirdness.
Good old triple equals.
Update geometry Sandcastle example
Tweaks for two-pass primitive rendering
Merge pull request #1100 from AnalyticalGraphicsInc/translucentGeometry

Translucent Geometry
Updated CHANGES.md
Merge pull request #1103 from AnalyticalGraphicsInc/nexus4

Make Cesium work again on the Nexus 4
Replace `@return` with `@returns`

Fixes #1091
Merge pull request #1105 from AnalyticalGraphicsInc/issue1091

Replace `@return` with `@returns`