Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index c854d5a..d57ce9f 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,8 @@ Revision history for Perl extension Algorithm-SAT-Backtracking

 {{$NEXT}}

+0.02 2014-12-03T11:30:42Z
+
     - Added Algorithm::SAT::Expression>

 0.01 2014-12-01T14:45:58Z