RectAnalyzer class added.  getBoundingRects(), intersect(), and getBoundingRect() implemented.
RectAnalyzer methods tested.
RectAnalyzer methods being used in Analyzer.detectFace().
Analyzer code simplified.
ObjectTracker.hasLostObject() conditions changed.  Improved tracker performance on FOREMAN test case.
Face width/height plausibility dimensions revised.
Merge branch 'feature/face_tracker_improvements'