deleteScript can now be a callback (#428)

* Delete Script can now be a callback

* Fixed backwards compat issue

src/js/images.js

@@ -546,7 +546,7 @@
 
             if (images.length) {
                 for (i = 0; i < images.length; i++) {
-                    this.deleteFile(images[i].attr('src'));
+                    this.deleteFile(images[i].attr('src'), images[i]);
 
                     $parent = images[i].closest('.medium-insert-images');
                     images[i].closest('figure').remove();
@@ -577,17 +577,25 @@
     /**
      * Makes ajax call to deleteScript
      *
-     * @param {String} file File name
+     * @param {string} file The name of the file to delete
+     * @param {jQuery} $el The jQuery element of the file to delete
      * @returns {void}
      */
 
-    Images.prototype.deleteFile = function (file) {
+    Images.prototype.deleteFile = function (file, $el) {
+        // only take action if there is a truthy value
         if (this.options.deleteScript) {
-            $.ajax($.extend(true, {}, {
-                url: this.options.deleteScript,
-                type: this.options.deleteMethod || 'POST',
-                data: { file: file }
-            }, this.options.fileDeleteOptions));
+            // try to run it as a callback
+            if (typeof this.options.deleteScript === 'function') {
+                this.options.deleteScript(file, $el);
+            // otherwise, it's probably a string, call it as ajax
+            } else {
+                $.ajax($.extend(true, {}, {
+                    url: this.options.deleteScript,
+                    type: this.options.deleteMethod || 'POST',
+                    data: { file: file }
+                }, this.options.fileDeleteOptions));
+            }
         }
     };