feat(dart/transform) Register parameter metadata information

Adds any metadata attached to a parameter to the "parameters" value
passed in to `registerType`.

For example:
`MyComponent(@Inject(Foo) foo)` generates
`"parameters": const [const [const Inject(Foo)]]`

Also reorganizes the testing code.

Closes #7

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

@@ -0,0 +1,30 @@
+library angular2.test.transform.directive_processor.all_tests;
+
+import 'dart:io';
+import 'package:barback/barback.dart';
+import 'package:angular2/src/transform/directive_processor/rewriter.dart';
+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:unittest/vm_config.dart';
+
+import '../common/read_file.dart';
+
+var formatter = new DartFormatter();
+
+void allTests() {
+  test('should preserve parameter annotations as const instances', () {
+    var inputPath = 'parameter_metadata/soup.dart';
+    var expected = _readFile('parameter_metadata/expected/soup.ngDeps.dart');
+    var output =
+        formatter.format(createNgDeps(_readFile(inputPath), inputPath));
+    expect(output, equals(expected));
+  });
+}
+
+var pathBase = 'directive_processor';
+
+/// Smooths over differences in CWD between IDEs and running tests in Travis.
+String _readFile(String path) => readFile('$pathBase/$path');

modules/angular2/test/transform/directive_processor/parameter_metadata/expected/soup.ngDeps.dart

@@ -0,0 +1,17 @@
+library dinner.soup;
+
+import 'soup.dart';
+import 'package:angular2/src/core/annotations/annotations.dart';
+
+bool _visited = false;
+void setupReflection(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(SoupComponent, {
+      "factory":
+          (String description, salt) => new SoupComponent(description, salt),
+      "parameters": const [const [Tasty, String], const [const Inject(Salt)]],
+      "annotations": const [const Component(selector: '[soup]')]
+    });
+} // {"version":1,"importOffset":104,"registerOffset":451,"imports":["package:angular2/src/core/annotations/annotations.dart"]}

modules/angular2/test/transform/directive_processor/parameter_metadata/soup.dart

@@ -0,0 +1,8 @@
+library dinner.soup;
+
+import 'package:angular2/src/core/annotations/annotations.dart';
+
+@Component(selector: '[soup]')
+class SoupComponent {
+  SoupComponent(@Tasty String description, @Inject(Salt) salt);
+}