Checking in changes prior to tagging of version 0.17.

Changelog diff is:

diff --git a/Changes b/Changes
index 14ff729..3fe4882 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Algorithm::HyperLogLog

+0.17    Fri Jun 14 02:02:00 2013
+        - Fixed warning in perl-5.18
+
 0.16    Sat May 11 16:05:00 2013
         - Fixed broken test