Initial commit of Dart transformer to generate constructor stubs, see https://github.com/angular/an…

modules/angular2/src/transform/options.dart

+library angular2.transformer;
+
+import 'package:path/path.dart' as path;
+
+class TransformerOptions {
+  final String entryPoint;
+  final String newEntryPoint;
+  final String htmlEntryPoint;
+
+  TransformerOptions(this.entryPoint, this.newEntryPoint, this.htmlEntryPoint);
+
+  bool inSameTopLevelDir() {
+    var expectedDir = path.split(htmlEntryPoint)[0];
+    return (expectedDir == path.split(entryPoint)[0] &&
+        expectedDir == path.split(newEntryPoint)[0]);
+  }
+}