Added SceneCache Transform SOP.

This node applies transformations from a SceneCache file directly on the points and primitives at the SOP level. In "Name" mode, it applies a different transformation per named shape, using the name as a relative path to the SceneCache file and root. In "Root" mode, it applies a single transformation from the SceneCache file to the entire input.
Merge pull request #183 from andrewkaufman/sccXform

Added SceneCache Transform SOP