Add async initialization for Intl.message and an example

pkg/pkg.status

Index: pkg/pkg.status
===================================================================
--- pkg/pkg.status	(revision 12343)
+++ pkg/pkg.status	(working copy)
@@ -20,12 +20,10 @@
 intl/test/date_time_format_file_even_test: skip
 intl/test/date_time_format_file_odd_test: skip
 
-# Skip tests that force dartc to compile dart:io, which seems to be hopelessly
-# broken
-[ $compiler == dartc]
-intl/test/date_time_format_file_test: skip
-intl/test/date_time_format_file_even_test: Fail # issue 5143
-intl/test/date_time_format_file_odd_test: Fail # issue 5143
+# Skip intl_message tests that use mirrors on dart2js until it's been implemented there.
+[ $compiler == dart2js ]
+intl/test/intl_message_test: skip
+intl/test/intl_message_basic_example_test: skip
 
 [ $compiler == dartc ]
 unittest/test/mock_regexp_negative_test: fail