refactor($interval): do not use notify to trigger the callback

Do not use `$q.notify` to trigger the callback. This allows `$q` to be replaced
with another Promise/A+ compilant library

Author: lgalfaso

src/ng/interval.js

@@ -2,8 +2,8 @@
 
 
 function $IntervalProvider() {
-  this.$get = ['$rootScope', '$window', '$q', '$$q',
-       function($rootScope,   $window,   $q,   $$q) {
+  this.$get = ['$rootScope', '$window', '$q', '$$q', '$browser',
+       function($rootScope,   $window,   $q,   $$q,   $browser) {
     var intervals = {};
 
 
@@ -144,11 +144,14 @@ function $IntervalProvider() {
 
       count = isDefined(count) ? count : 0;
 
-      promise.then(null, null, (!hasParams) ? fn : function() {
-        fn.apply(null, args);
-      });
-
       promise.$$intervalId = setInterval(function tick() {
+        if (intervals[promise.$$intervalId]) {
+          if (skipApply) {
+            $browser.defer(callback);
+          } else {
+            $rootScope.$evalAsync(callback);
+          }
+        }
         deferred.notify(iteration++);
 
         if (count > 0 && iteration >= count) {
@@ -164,6 +167,14 @@ function $IntervalProvider() {
       intervals[promise.$$intervalId] = deferred;
 
       return promise;
+
+       function callback() {
+         if (!hasParams) {
+           fn(iteration);
+         } else {
+           fn.apply(null, args);
+         }
+       }
     }