Update rocksdb
Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index e2c7854..d5920d0 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension RocksDB

 {{$NEXT}}

+0.02 2013-12-26T02:14:22Z
+    - Update rocksdb (71ddb117)
+    - Check C++11 Compiler
+    - Fix a packaging problem
+    - Supress build warnings
+
 0.01 2013-12-16T15:57:08Z

     - original version