fix(stateFilters): mark state filters as stateful. closes #1479

angular 1.3. added a perf enhancement where filters must be stateless, or mark themselves as stateful.

src/stateFilters.js

@@ -9,9 +9,11 @@
  */
 $IsStateFilter.$inject = ['$state'];
 function $IsStateFilter($state) {
-  return function(state) {
+  var isFilter = function (state) {
     return $state.is(state);
   };
+  isFilter.$stateful = true;
+  return isFilter;
 }
 
 /**
@@ -25,9 +27,11 @@ function $IsStateFilter($state) {
  */
 $IncludedByStateFilter.$inject = ['$state'];
 function $IncludedByStateFilter($state) {
-  return function(state) {
+  var includesFilter = function (state) {
     return $state.includes(state);
   };
+  includesFilter.$stateful = true;
+  return  includesFilter;
 }
 
 angular.module('ui.router.state')