refactor(injector): turn scope into a service

- turn scope into a $rootScope service.
- injector is now a starting point for creating angular application.
- added inject() method which wraps jasmine its/beforeEach/afterEach,
  and which allows configuration and injection of services.
- refactor tests to use inject() where possible

BREAK:
- removed angular.scope() method

example/personalLog/test/personalLogSpec.js

@@ -2,8 +2,9 @@ describe('example.personalLog.LogCtrl', function() {
   var logCtrl;
 
   function createNotesCtrl() {
-    var scope = angular.scope();
-    scope.$cookies = scope.$service('$cookies');
+    var injector = angular.injector();
+    var scope = injector('$rootScope');
+    scope.$cookies = injector('$cookies');
     return scope.$new(example.personalLog.LogCtrl);
   }