FIXED MULTIFILE ERROR AND ADJUSTED EXAMPLE

Example includes buttons that can print data about all the images that are
'uploaded' on edit-div, as well as one that copies the edit-div to another
div, maintaining interactivity on any uploaded images.

Multifile drag_and_drop uploading is fixed and functional.

Uploaded image element ids are now based on their original filenames (with
random numbers prepended). For example, a file with the name Dogs.jpg may
be uploaded and have an element id of 0_12332585584_Dogs.jpg.

Room for improvement: Firefox still drops uploading data. Dropping data is
caught by a conditional related to the upload image size. Functionality
does work during the second attempt.