cleanup unneeded library declarations and add missing copyright notices
diff --git a/pkgs/markdown/benchmark/benchmark.dart b/pkgs/markdown/benchmark/benchmark.dart
index ed6b521..06a2cba 100644
--- a/pkgs/markdown/benchmark/benchmark.dart
+++ b/pkgs/markdown/benchmark/benchmark.dart
@@ -2,8 +2,6 @@
 // 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 markdown.benchmark.benchmark;
-
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
diff --git a/pkgs/markdown/example/highlight.dart b/pkgs/markdown/example/highlight.dart
index be62357..4460b6e 100644
--- a/pkgs/markdown/example/highlight.dart
+++ b/pkgs/markdown/example/highlight.dart
@@ -1,3 +1,7 @@
+// Copyright (c) 2017, 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.
+
 @JS('hljs')
 library hljs;
 
diff --git a/pkgs/markdown/lib/src/ast.dart b/pkgs/markdown/lib/src/ast.dart
index cf2b1f7..12a79cc 100644
--- a/pkgs/markdown/lib/src/ast.dart
+++ b/pkgs/markdown/lib/src/ast.dart
@@ -2,8 +2,6 @@
 // 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 markdown.src.ast;
-
 typedef Node Resolver(String name);
 
 /// Base class for any AST item.
diff --git a/pkgs/markdown/lib/src/block_parser.dart b/pkgs/markdown/lib/src/block_parser.dart
index 20e05ba..482ca35 100644
--- a/pkgs/markdown/lib/src/block_parser.dart
+++ b/pkgs/markdown/lib/src/block_parser.dart
@@ -2,8 +2,6 @@
 // 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 markdown.block_parser;
-
 import 'ast.dart';
 import 'document.dart';
 import 'util.dart';
diff --git a/pkgs/markdown/lib/src/document.dart b/pkgs/markdown/lib/src/document.dart
index 32361d7..aa45092 100644
--- a/pkgs/markdown/lib/src/document.dart
+++ b/pkgs/markdown/lib/src/document.dart
@@ -1,4 +1,6 @@
-library markdown.src.document;
+// Copyright (c) 2017, 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.
 
 import 'ast.dart';
 import 'block_parser.dart';
diff --git a/pkgs/markdown/lib/src/html_renderer.dart b/pkgs/markdown/lib/src/html_renderer.dart
index f88f2c4..0e545d1 100644
--- a/pkgs/markdown/lib/src/html_renderer.dart
+++ b/pkgs/markdown/lib/src/html_renderer.dart
@@ -2,8 +2,6 @@
 // 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 markdown.src.html_renderer;
-
 import 'dart:collection';
 
 import 'ast.dart';
diff --git a/pkgs/markdown/lib/src/inline_parser.dart b/pkgs/markdown/lib/src/inline_parser.dart
index 8b82a50..cc01f73 100644
--- a/pkgs/markdown/lib/src/inline_parser.dart
+++ b/pkgs/markdown/lib/src/inline_parser.dart
@@ -2,8 +2,6 @@
 // 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 markdown.src.inline_parser;
-
 import 'ast.dart';
 import 'document.dart';
 import 'util.dart';
diff --git a/pkgs/markdown/test/util.dart b/pkgs/markdown/test/util.dart
index decfe42..db71fc0 100644
--- a/pkgs/markdown/test/util.dart
+++ b/pkgs/markdown/test/util.dart
@@ -2,8 +2,6 @@
 // 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 markdown.test.util;
-
 import 'dart:mirrors';
 
 import 'package:expected_output/expected_output.dart';