Added option to save/not save the cropped image to media library

git-svn-id: https://plugins.svn.wordpress.org/acf-image-crop-add-on/trunk@935877 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readmes

git-svn-id: https://plugins.svn.wordpress.org/acf-image-crop-add-on/trunk@935879 b8457f37-d9ea-0310-8a92-e5e31aec5664