Checking in changes prior to tagging of version 0.31.

Changelog diff is:

diff --git a/Changes b/Changes
index 27a4007..253c0b2 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,8 @@ Revision history for Perl extension OrePAN2

 {{$NEXT}}

+0.31 2014-09-08T19:51:08Z
+
     - Fix some undef warnings (miyagawa)
     - Add an option to use MetaCPAN for provides lookups (oalders)
     - Update minimum version of Archive::Extract to suppress warnings