New plugin class for CIDetector

For the next plugins we'll add a new CIDetectorMBS class for the Core Image face detector. So if you pass in a CIImage, you can get a list of feature objects for the detected faces. Our example simply draws a rectangle for the face and circles for the eyes and mouth.

Requires Mac OS X 10.7 or newer.

Will be added for next prerelease. Please try once it's available.