Make the date formatting library visible in apidoc by merging it into Intl

pkg/intl/lib/intl.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Internationalization object providing access to message formatting objects,
  * date formatting, parsing, bidirectional text relative to a specific locale.
  */
 #library('intl');
 
-#import('date_format.dart');
 #import('src/intl_helpers.dart');
+#import('dart:math');
+#import('date_symbols.dart');
+#import('src/date_format_internal.dart');
 
+#source('date_format.dart');
+#source('src/date_format_field.dart');
+#source('src/date_format_helpers.dart');
 #source('bidi_formatter.dart');
 #source('bidi_utils.dart');
 
 class Intl {
   /**
    * String indicating the locale code with which the message is to be
    * formatted (such as en-CA).
    */
   String _locale;
 
@@ skipping 187 matching lines @@
 /**
  * Initialize the message lookup mechanism. This is for internal use only.
  * User applications should import message_lookup_local.dart and call
  * initializeMessages
  */
 void initializeInternalMessageLookup(Function lookupFunction) {
   if (_messageLookup is UninitializedLocaleData) {
     _messageLookup = lookupFunction();
   }
 }