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

modules/angular2/src/transform/options.dart

-library angular2.transformer;
+library angular2.src.transform;
 
 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]);
   }
 }