feat(translateService): removes empty options object requirement for …

…loaders

currently, when using custom loaders for asynchronous loading,
you have to at least pass an empty options object to
useLoader(..).

now, when this comes in, you can leave it off when don't need
any optional options for you custom laoder

src/translate.js

@@ -278,7 +278,7 @@ angular.module('pascalprecht.translate').provider('$translate', ['$STORAGE_KEY',
    */
   this.useLoader = function (loaderFactory, options) {
     $loaderFactory = loaderFactory;
-    $loaderOptions = options;
+    $loaderOptions = options || {};
   };
 
   /**

test/unit/translateServiceSpec.js

@@ -454,7 +454,7 @@ describe('pascalprecht.translate', function () {
 
       beforeEach(module('pascalprecht.translate', function ($translateProvider, $provide) {
 
-        $translateProvider.useLoader('customLoader', {});
+        $translateProvider.useLoader('customLoader');
 
         $provide.factory('customLoader', ['$q', '$timeout', function ($q, $timeout) {
           return function (options) {