Removed the hard-coded icons for "expanded" and "collapsed"
	jquery.slimmenu.js
		Replaced &#9650; and &#9660; with an empty string
	slimmenu.css
		Added the following code:
			ul.slimmenu span.sub-collapser i::before {
				content: '►';
			}

			ul.slimmenu span.sub-collapser.expanded i::before {
				content: '▼';
			}

Fixed a bug where the menu would be hidden in iOS when the URL bar changed size
	jquery.slimmenu.js
		Replaced:
            $(window).on('resize', { el: this.element, options: this.options }, this.resizeMenu);
		
		With:
            var that = this,
            	$window = $window = $(window),
            	lastWidth = $window.width();
            $window.on('resize', { el: this.element, options: this.options }, function(event) {
            	var newWidth = $window.width();
            	if (newWidth != lastWidth) {
	            	that.resizeMenu(event);
	            	lastWidth = newWidth;
	            }
            });

Added a class when responsive menu ip open
	jquery.slimmenu.js
		Added the following code:
			 $(this).toggleClass('on');