Account for callbacks in 'fancybox'.

fancybox/fancybox-tests.ts

@@ -116,7 +116,7 @@ $(".fancybox").fancybox({
     }
 });
 $(".fancybox").fancybox({
-    beforeLoad: function () {
+    beforeLoad: () => {
         this.title = 'Image ' + (this.index + 1) + ' of ' + this.group.length + (this.title ? ' - ' + this.title : '');
     }
 });

fancybox/fancybox.d.ts

@@ -6,7 +6,7 @@
 
 /// <reference path="../jquery/jquery.d.ts" />
 
-interface FancyboxOptions {
+interface FancyboxOptions extends FancyboxCallback {
     padding?: any; // number or []
     margin?: any; // number or []
     width?: any; // number or []
@@ -96,16 +96,16 @@ interface FancyboxMethods {
 }
 
 interface FancyboxCallback {
-    onCancel;
-    beforeLoad;
-    afterLoad;
-    beforeShow;
-    afterShow;
-    beforeClose;
-    afterClose;
-    onUpdate;
-    onPlayStart;
-    onPlayEnd;
+    onCancel?: Function;
+    beforeLoad?: Function;
+    afterLoad?: Function;
+    beforeShow?: Function;
+    afterShow?: Function;
+    beforeClose?: Function;
+    afterClose?: Function;
+    onUpdate?: Function;
+    onPlayStart?: Function;
+    onPlayEnd?: Function;
 }
 
 interface FancyboxThumbnailHelperOptions {