fix:scope - reintroduce support for eager services

8cad231 broke $eager services

Problem is that the injector.eager function is not invoked when a new scope
is created. Added a test to make sure service is eagerly instantiated.

Closes angular#403

Author: Di Peng

src/Scope.js

@@ -525,7 +525,7 @@ function createScope(parent, providers, instanceCache) {
      * @param {string} serviceId String ID of the service to return.
      * @returns {*} Value, object or function returned by the service factory function if any.
      */
-    instance.$service = createInjector(instance, providers, instanceCache);
+    (instance.$service = createInjector(instance, providers, instanceCache)).eager();
   }
 
   $log = instance.$service('$log');

test/AngularSpec.js

@@ -516,6 +516,13 @@ describe('angular', function(){
 	  angular.service('svc2', function(svc1) { return 'svc2-' + svc1; });
 	  expect(angular.scope().$service('svc2')).toEqual('svc2-svc1');
     });
+
+    it('should eagerly instantiate a service if $eager is true', function() {
+      var log = [];
+      angular.service('svc1', function() { log.push('svc1'); }, {$eager: true});
+      angular.scope();
+      expect(log).toEqual(['svc1']);
+    });
   });
 
   describe('isDate', function() {