init = function( wait ) {
            var a = arr.shift();
            if ( a ) {
                window.setTimeout(function() {
                    self.lazyLoad(a, function() {
                        init( true );
                    });
                }, ( delay && wait ) ? delay : 0 );
            }
        }
Lazy-loads thumbnails in chunks.
        This method automatcally chops up the loading process of many thumbnails into chunks

        @param {Number} size Size of each chunk to be loaded
        @param {Number} [delay] Delay between each loads

        @returns Instance