Function encloses

encloses(r1, r2, allowSharedEdges?): boolean
Calculates whether or not r2 is completely enclosed by r1.
Parameters
- r1: BoundingBox
  First rectangle
- r2: BoundingBox
  Second rectangle
- Optional allowSharedEdges: boolean
  If true, the concept of enclosure allows for one or more edges to be shared by the two rectangles.
Returns boolean
True if r1 encloses r2, false otherwise.