Removed createCallback function

src/openseadragon.js

@@ -2252,42 +2252,6 @@ function OpenSeadragon( options ){
         },
 
 
-        /**
-         * Similar to OpenSeadragon.delegate, but it does not immediately call
-         * the method on the object, returning a function which can be called
-         * repeatedly to delegate the method. It also allows additional arguments
-         * to be passed during construction which will be added during each
-         * invocation, and each invocation can add additional arguments as well.
-         *
-         * @function
-         * @param {Object} object
-         * @param {Function} method
-         * @param [args] any additional arguments are passed as arguments to the
-         *  created callback
-         * @returns {Function}
-         */
-        createCallback: function( object, method ) {
-            //TODO: This pattern is painful to use and debug.  It's much cleaner
-            //      to use pinning plus anonymous functions.  Get rid of this
-            //      pattern!
-            var initialArgs = [],
-                i;
-            for ( i = 2; i < arguments.length; i++ ) {
-                initialArgs.push( arguments[ i ] );
-            }
-
-            return function() {
-                var args = initialArgs.concat( [] ),
-                    i;
-                for ( i = 0; i < arguments.length; i++ ) {
-                    args.push( arguments[ i ] );
-                }
-
-                return method.apply( object, args );
-            };
-        },
-
-
         /**
          * Retrieves the value of a url parameter from the window.location string.
          * @function