Checking in changes prior to tagging of version 1.12.

Changelog diff is:

diff --git a/Changes b/Changes
index 39feb75..862e6fb 100644
--- a/Changes
+++ b/Changes
@@ -3,6 +3,10 @@ Changes

 {{$NEXT}}

+1.12 2014-02-21T05:42:17Z
+    * Previously, Impl::File did not populate the content_type field.
+      This is now done using Plack::MIME (reported by tokuhirom)
+
 1.11 2013-06-11T06:02:04Z
     * GET /foo/bar.tx WHERE /foo is a non-existing bucket used to
       return 500, but now returns 404