Bundle update

Gemfile.lock

 GIT
   remote: git://github.com/activeadmin/activeadmin.git
-  revision: 75c1d48788eaf55e0cc8795ee214586bf0bdf80e
+  revision: 6f7def4de94c1e8b8a3de8d08cbb41fe8b9a96d6
   specs:
     activeadmin (1.0.0.pre)
       arbre (~> 1.0, >= 1.0.2)
@@ -150,7 +150,7 @@ GEM
       actionpack (>= 3.2.13)
     formtastic_i18n (0.1.1)
     geocoder (1.2.6)
-    guard (2.8.2)
+    guard (2.9.0)
       formatador (>= 0.2.4)
       listen (~> 2.7)
       lumberjack (~> 1.0)