refactor(dart/transform): Use package:guinness in tests

`guinness` is a Dart port of Jasmine. Since the rest of Angular 2 uses
Jasmine, use it for the transformer too.

Closes #8

Closes #1037

Closes #1000

modules/angular2/test/transform/bind_generator/all_tests.dart

@@ -7,7 +7,7 @@ import 'package:angular2/src/transform/common/formatter.dart';
 import 'package:code_transformers/tests.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:path/path.dart' as path;
-import 'package:unittest/unittest.dart';
+import 'package:guinness/guinness.dart';
 import 'package:unittest/vm_config.dart';
 
 import '../common/read_file.dart';
@@ -17,7 +17,7 @@ var formatter = new DartFormatter();
 void allTests() {
   var reader = new TestAssetReader();
 
-  test('should generate a setter for a `bind` property in an annotation.',
+  it('should generate a setter for a `bind` property in an annotation.',
       () async {
     var inputPath = 'bind_generator/basic_bind_files/bar.ng_deps.dart';
     var expected = formatter.format(
@@ -25,10 +25,10 @@ void allTests() {
 
     var output = formatter
         .format(await createNgSetters(reader, new AssetId('a', inputPath)));
-    expect(output, equals(expected));
+    expect(output).toEqual(expected);
   });
 
-  test('should generate a single setter when multiple annotations bind to the '
+  it('should generate a single setter when multiple annotations bind to the '
       'same property.', () async {
     var inputPath =
         'bind_generator/duplicate_bind_name_files/soup.ng_deps.dart';
@@ -37,6 +37,6 @@ void allTests() {
 
     var output = formatter
         .format(await createNgSetters(reader, new AssetId('a', inputPath)));
-    expect(output, equals(expected));
+    expect(output).toEqual(expected);
   });
 }