Get rid of all the library tags.

lib/src/middleware.dart

 // Copyright (c) 2014, 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 shelf.middleware;
-
 import 'dart:async';
 
 import 'request.dart';
 import 'response.dart';
 import 'handler.dart';
 import 'hijack_exception.dart';
 
 /// A function which creates a new [Handler] by wrapping a [Handler].
 ///
 /// You can extend the functions of a [Handler] by wrapping it in
@@ skipping 50 matching lines @@
     return (request) {
       return new Future.sync(() => requestHandler(request)).then((response) {
         if (response != null) return response;
 
         return new Future.sync(() => innerHandler(request)).then(
             (response) => responseHandler(response), onError: onError);
       });
     };
   };
 }