ng-sortable: support configuration constant

ng-sortable.js

@@ -26,7 +26,8 @@
 
 	angular.module('ng-sortable', [])
 		.constant('version', '0.3.7')
-		.directive('ngSortable', ['$parse', function ($parse) {
+		.constant('ngSortableConfig', {})
+		.directive('ngSortable', ['$parse', 'ngSortableConfig', function ($parse, ngSortableConfig) {
 			var removed,
 				nextSibling;
 
@@ -67,7 +68,7 @@
 				scope: { ngSortable: "=?" },
 				link: function (scope, $el, attrs) {
 					var el = $el[0],
-						options = scope.ngSortable || {},
+						options = angular.extend(scope.ngSortable || {}, ngSortableConfig),
 						source = getSource(el),
 						watchers = [],
 						sortable

st/app.js

@@ -148,6 +148,9 @@
 
 	// Angular example
 	angular.module('todoApp', ['ng-sortable'])
+		.constant('ngSortableConfig', {onEnd: function() {
+			console.log('default onEnd()');
+		}})
 		.controller('TodoController', ['$scope', function ($scope) {
 			$scope.todos = [
 				{text: 'learn angular', done: true},