Update rails_admin dependency to version 0.3.0

Gemfile.lock

@@ -78,7 +78,7 @@ GEM
       treetop (~> 1.4.8)
     mime-types (1.19)
     multi_json (1.4.0)
-    nested_form (0.2.3)
+    nested_form (0.3.1)
     nokogiri (1.5.5)
     orm_adapter (0.4.0)
     pg (0.14.1)
@@ -103,7 +103,7 @@ GEM
       activesupport (= 3.2.9)
       bundler (~> 1.0)
       railties (= 3.2.9)
-    rails_admin (0.2.0)
+    rails_admin (0.3.0)
       bootstrap-sass (~> 2.1)
       builder (~> 3.0)
       coffee-rails (~> 3.1)
@@ -112,7 +112,7 @@ GEM
       jquery-rails (~> 2.1)
       jquery-ui-rails (~> 2.0)
       kaminari (~> 0.14)
-      nested_form (~> 0.2.3)
+      nested_form (> 0.2.3, < 0.4.0)
       rack-pjax (~> 0.6)
       rails (~> 3.1)
       remotipart (~> 1.0)