Checking in changes prior to tagging of version 0.28.

Changelog diff is:

diff --git a/Changes b/Changes
index 0d3d10d..f099b26 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension OrePAN2

 {{$NEXT}}

+0.28 2014-02-28T09:00:20Z
+
+    - Added orepan2-gc, orepan2-merge-index
+
 0.27 2014-02-28T07:58:02Z

     - Fixed caching bug.