Fix error messages
xt直した
Change to not necessity to call `use utf8;`
Update docs
Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index a04c2e3..8e66a09 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension WWW-NHKProgram-API

 {{$NEXT}}

+0.02 2014-02-05T14:43:31Z
+
+    - Change to not necessity to call `use utf8`
+    - Fix extend tests
+
 0.01 2014-02-05T02:46:03Z

     - original version