List version numbers without 'perl-' prefix in available_perls method.
Checking in changes prior to tagging of version 1.00.

Changelog diff is:

diff --git a/Changes b/Changes
index 3f35f2a..08da470 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension App::perlbuild

 {{$NEXT}}

+1.00 2013-05-29T09:01:22Z
+
+    [INCOMPATIBLE CHANGES]
+    - `--definitions` and #available_versions returns version number without 'perl-' prefix.
+      (tokuhirom)
+
 0.21 2013-05-28T14:35:30Z

     - Added `--definitions` option. This option is same as ruby-build.