Add Item inline for Chosen

inline add for Chosen.js

	$("form").bind("liszt:ready", function(event, chosen) {
		var chooseInstance = chosen.chosen,
			$chosenDrop = $(chooseInstance.search_results).parent();
		var $addHtml = $("<div/>", {
		        html: $("<input/>", {
    				type: "text",
    				keypress: function(e) {
    					if(e.which == 13) {
    						e.preventDefault();
    						var $this = $(this),
    							val = $this.val().trim();
    						$(event.target).append($("<option/>", {
    							text: val,
    							value: val.replace(" ", "_")
    						}))
    						chooseInstance.form_field_jq.trigger("liszt:updated");
    						$this.val('').blur()
    						var $resultsDiv = $chosenDrop.find(".chzn-results");
    						$resultsDiv.scrollTop($resultsDiv[0].scrollHeight);
    						chooseInstance.result_do_highlight($resultsDiv.children("li").last())
    					}

    				}
    			}),
				class: "add-item"
			});
		$chosenDrop.append($addHtml)
	});