Checking in changes prior to tagging of version 1.3.1.

Changelog diff is:

diff --git a/Changes b/Changes
index 3dc8667..b1183d7 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,11 @@
 Revision history for Perl extension App::plenv

+1.3.1 2013-01-24T11:56:38
+
+    [BUG FIX]
+    - expand ~ in --build-dir.
+      (tokuhirom)
+
 1.3.0 2013-01-24T11:28:10

     - added '--build-dir' argumetns for plenv-install.
Merge branch 'master' of github.com:tokuhirom/plenv
speciallize the shim file for cpanm. Speciallized version of 'cpanm'
shim runs rehashing after installing.