Move dart:web to pkg:htmlescape.

pkg/htmlescape/htmlescape.dart

Index: pkg/htmlescape/htmlescape.dart
diff --git a/lib/web/web.dart b/pkg/htmlescape/htmlescape.dart
similarity index 81%
rename from lib/web/web.dart
rename to pkg/htmlescape/htmlescape.dart
index 58ce510857e0490a7920f3c2a8dd529ad60c7ec8..6c5e4f85a142701b415b3c5e54d348471f6fca08 100644
--- a/lib/web/web.dart
+++ b/pkg/htmlescape/htmlescape.dart
@@ -2,10 +2,11 @@
 // 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("dart:web");
-
-// Web related functions and data that are not specific to a single environment
-// (e.g., only in a browser or only on a server).
+/**
+ * This library contains functions to escape strings for safe inclusion
+ * in HTML source.
+ */
+#library("htmlescape");
 
 /**
  * Escapes HTML-special characters of [text] so that the result can be