pkg/http_parser: created mini lib for http_date

pkg/http_parser/lib/src/http_date.dart

Index: pkg/http_parser/lib/src/http_date.dart
diff --git a/pkg/http_parser/lib/http_parser.dart b/pkg/http_parser/lib/src/http_date.dart
similarity index 96%
copy from pkg/http_parser/lib/http_parser.dart
copy to pkg/http_parser/lib/src/http_date.dart
index f9d8b8f5f1d0cd21fa5d9186a015763f2d5c85c4..47ac547a8fe77df43804e75ad5a0a2af8d9e7f80 100644
--- a/pkg/http_parser/lib/http_parser.dart
+++ b/pkg/http_parser/lib/src/http_date.dart
@@ -6,9 +6,6 @@ library http_parser;
 
 import 'package:string_scanner/string_scanner.dart';
 
-export 'src/media_type.dart';
-export 'src/web_socket.dart';
-
 const _WEEKDAYS = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
 const _MONTHS = const ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
     "Sep", "Oct", "Nov", "Dec"];
@@ -20,7 +17,6 @@ final _monthRegExp =
     new RegExp(r"Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec");
 final _digitRegExp = new RegExp(r"\d+");
 
-// TODO(nweiz): Move this into an http_parser package.
 /// Return a HTTP-formatted string representation of [date].
 ///
 /// This follows [RFC 822](http://tools.ietf.org/html/rfc822) as updated by [RFC
@@ -45,7 +41,6 @@ String formatHttpDate(DateTime date) {
   return buffer.toString();
 }
 
-// TODO(nweiz): Move this into an http_parser package.
 /// Parses an HTTP-formatted date into a UTC [DateTime].
 ///
 /// This follows [RFC