Checking in changes prior to tagging of version 1.13.

Changelog diff is:

diff --git a/Changes b/Changes
index c9f9e6c..4e08cc3 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,7 @@
+1.13 Sat Feb 15 11:49:24 PST 2014
+  - added --tree <DIR> option which lets you
+    specify more directories to search for perl modules.
+    Thanks to @duncanmg for adding this..

 1.12 Fri Apr 29 21:11:05 PDT 2011
   - require latest Squatting
give tree a default value so it doesn't crash Squatting::On::PSGI