fix(rating): make deprecated controller work with 1.3.x

Closes #4582

src/rating/rating.js

@@ -23,10 +23,10 @@ angular.module('ui.bootstrap.rating', [])
 
     this.stateOn = angular.isDefined($attrs.stateOn) ? $scope.$parent.$eval($attrs.stateOn) : ratingConfig.stateOn;
     this.stateOff = angular.isDefined($attrs.stateOff) ? $scope.$parent.$eval($attrs.stateOff) : ratingConfig.stateOff;
-    var tmpTitles = angular.isDefined($attrs.titles)  ? $scope.$parent.$eval($attrs.titles) : ratingConfig.titles ;    
+    var tmpTitles = angular.isDefined($attrs.titles)  ? $scope.$parent.$eval($attrs.titles) : ratingConfig.titles ;
     this.titles = angular.isArray(tmpTitles) && tmpTitles.length > 0 ?
       tmpTitles : ratingConfig.titles;
-    
+
     var ratingStates = angular.isDefined($attrs.ratingStates) ?
       $scope.$parent.$eval($attrs.ratingStates) :
       new Array(angular.isDefined($attrs.max) ? $scope.$parent.$eval($attrs.max) : ratingConfig.max);
@@ -39,15 +39,15 @@ angular.module('ui.bootstrap.rating', [])
     }
     return states;
   };
-  
+
   this.getTitle = function(index) {
     if (index >= this.titles.length) {
       return index + 1;
     } else {
       return this.titles[index];
     }
   };
-  
+
   $scope.rate = function(value) {
     if (!$scope.readonly && value >= 0 && value <= $scope.range.length) {
       ngModelCtrl.$setViewValue(ngModelCtrl.$viewValue === value ? 0 : value);
@@ -109,10 +109,10 @@ angular.module('ui.bootstrap.rating')
     $log.warn('RatingController is now deprecated. Use UibRatingController instead.');
   }
 
-  return $controller('UibRatingController', {
+  angular.extend(this, $controller('UibRatingController', {
     $scope: $scope,
     $attrs: $attrs
-  });
+  }));
 }])
 
 .directive('rating', ['$log', '$ratingSuppressWarning', function($log, $ratingSuppressWarning) {