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

modules/angular2/src/transform/html_transform.dart

-library angular2.transformer;
+library angular2.src.transform;
 
 import 'dart:async';
 import 'package:barback/barback.dart';
 import 'package:html5lib/dom.dart' as dom;
 import 'package:html5lib/parser.dart' show parse;
 import 'package:path/path.dart' as path;
 
 import 'options.dart';
 
 Future transformHtmlEntryPoint(
@@ skipping 31 matching lines @@
       found = true;
     }
     if (!found) {
       transform.logger.error('Unable to find script for ${options.entryPoint} '
           'in ${options.htmlEntryPoint}.');
     }
     return transform.addOutput(
         new Asset.fromString(transform.primaryInput.id, doc.outerHtml));
   });
 }