function RotationPlugin() {
		throw("Rotation plugin cannot be instantiated.")
	}
The RotationPlugin for TweenJS modifies tweens of rotation properties. These properties can be changed when calling
`install`. Install using:

	RotationPlugin.install(props);

After installation, by default all rotation tweens will rotate in the shortest direction. For example, if you
tween from `rotation=15` to `rotation=330`, it will rotate counter-clockwise 45 degrees. You can modify this behaviour by
specifying a `rotationDir` tween value. A value of `-1` will force CCW rotation, `1` will force CW, and `0` will
disable the plugin effects for that portion of the tween.

Note that the `rotationDir` value will persist until overridden in future `to` calls. Set it to null to re-enable the default behavior.

	// this tween will rotate: CCW, then CCW (because rotationDir persists), then CW.
	myTween.get(foo).to({rotation:30, rotationDir:-1}).to({rotation:60}).to({rotation:10, rotationDir:1});

You can also disable the plugin completely for a tween by setting `tween.pluginData.Rotation_disabled=true`.

@class RotationPlugin
@static