Added a method to the SceneShapeInterface to return the current time.
Corrected a typo.
Added support for geometry snapping to the SceneShape.
Added include guards to enable geometry snapping only on API versions that are greater than 2013.
Updated the changes log.
Fixed a bug with the NDC point calculation.
Simplified the snap() method by using pre-existing methods.
Changed the query of the nearest vertex to a point to a comparison in object space rather than world space.
Removing ModelCache

Fixes #31
Merge pull request #58 from goddardl/SceneShapeSnapping

Geometry snapping to the SceneShape.
Merge pull request #68 from andrewkaufman/rmModelCache

Removing ModelCache