Expose the clipping path, somehow #114
Description
PLAYA entirely ignores any operations on the clipping path. This is sort of okay since we want to be able to get everything, including invisible things, out of a PDF.
It's obviously not okay since the clipping path is a thing that you might want to get out of a PDF.
Obviously, applying the clipping path is way beyond the scope of PLAYA, since it would involve implementing, well, clipping. But in many practical applications the clipping path is really simple, just a rectangle, so even someone totally ignorant of computer graphics algorithms like me might find it useful.