Cesium b23

b23 - 2013-12-02

Highlights include:

• Added perPositionHeight option to PolygonGeometry and PolygonOutlineGeometry.
• Added QuaternionSpline and LinearSpline.
• Added Quaternion.log, Quaternion.exp, Quaternion.innerQuadrangle, and Quaternion.squad.
• Added Matrix3.inverse and Matrix3.determinant.

See the change log for a full list of changes