Support for observable models, fixes #259

lib/src/files.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library files;
 
 import 'package:html5lib/dom.dart';
 import 'file_system/path.dart';
 import 'info.dart';
 
 /** An input file to process by the template compiler. */
 class SourceFile {
   final Path path;
 
   final bool isDart;
   Document document;
   String code;
 
   SourceFile(this.path, {this.isDart: false});
 
   String toString() => "<#SourceFile $path>";
 }
 
 /** An output file to generated by the template compiler. */
 class OutputFile {
   final Path path;
   final String contents;
-  
-  /** 
+
+  /**
    * Path to the source file that was transformed into this OutputFile, `null`
    * for files that are generated and do not correspond to an input
    * [SourceFile].
    */
   final Path source;
 
   OutputFile(this.path, this.contents, {Path source})
       : source = source;
 }