Revert "Merge pull request #5 from agentlink/master"

This reverts commit 9e2694f80aa3c9631a646a16daacf09a647be810, reversing
changes made to 7d698316bbf37b8e331d70dd696729508cd5a7b3.
Added a new wrapper class around JBCroppableView called JBCroppableImageView. I have renamed JBCroppableView files to JBCroppableLayer so that it is less confusing. With this new UIImageView class, it is much simpler to manage setting up and manipulating crop able images. Just set up the image view as you normally would. Use methods addPoint() and removePoint() to alter the point count, and crop() and reverseCrop() to crop the image. After cropping is complete, use getCroppedImage() to get a copy of the changes. I have also changed the algorithm to make the whole thing much faster and less buggy (no more memory warnings!)