refactor(dart): Run dartfmt 0.1.8

Format Dart code using dartfmt 0.1.8. Update pubspec to require
dart_style 0.1.8.

modules/angular2/test/transform/directive_metadata_extractor/directive_metadata_files/directive_export_as.ng_deps.dart

@@ -2,7 +2,17 @@ library examples.hello_world.index_common_dart.ng_deps.dart;
 
 import 'hello.dart';
 import 'package:angular2/angular2.dart'
-    show bootstrap, Component, Directive, View, NgElement, onChange, onDestroy, onInit, onCheck, onAllChangesDone;
+    show
+        bootstrap,
+        Component,
+        Directive,
+        View,
+        NgElement,
+        onChange,
+        onDestroy,
+        onInit,
+        onCheck,
+        onAllChangesDone;
 
 var _visited = false;
 void initReflector(reflector) {
@@ -12,8 +22,6 @@ void initReflector(reflector) {
     ..registerType(HelloCmp, {
       'factory': () => new HelloCmp(),
       'parameters': const [const []],
-      'annotations': const [
-        const Directive(exportAs: 'exportAsName')
-      ]
+      'annotations': const [const Directive(exportAs: 'exportAsName')]
     });
 }