Get rid of all the library tags.

lib/src/pipeline.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.pipeline;
-
 import 'handler.dart';
 import 'middleware.dart';
 
 /// A helper that makes it easy to compose a set of [Middleware] and a
 /// [Handler].
 ///
 ///     var handler = const Pipeline()
 ///         .addMiddleware(loggingMiddleware)
 ///         .addMiddleware(cachingMiddleware)
 ///         .addHandler(application);
@@ skipping 19 matching lines @@
   /// [Request] if all of the middleware in the pipeline have passed the request
   /// through.
   Handler addHandler(Handler handler) {
     if (_middleware == null) return handler;
     return _parent.addHandler(_middleware(handler));
   }
 
   /// Exposes this pipeline of [Middleware] as a single middleware instance.
   Middleware get middleware => addHandler;
 }