Add exports

Author: mosuem

pkgs/intl_translation/lib/extract_messages.dart

@@ -28,6 +28,8 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'src/messages/main_message.dart';
 import 'visitors/message_finding_visitor.dart';
 
+export 'src/messages/main_message.dart' show MainMessage;
+
 /// A function that takes a message and does something useful with it.
 typedef OnMessage = void Function(String message);
 

pkgs/intl_translation/lib/generate_localized.dart

@@ -20,6 +20,9 @@ import 'package:path/path.dart' as path;
 import 'src/messages/main_message.dart';
 import 'src/messages/message.dart';
 
+export 'src/messages/main_message.dart' show MainMessage;
+export 'src/messages/message.dart' show Message;
+
 class MessageGeneration {
   /// If the import path following package: is something else, modify the
   /// [intlImportPath] variable to change the import directives in the generated