use explicit autoloads rather than from paths

config/application.rb

@@ -27,7 +27,7 @@ module Postal
     end
 
     # Include from lib
-    config.eager_load_paths += %W(#{config.root}/lib #{config.root}/app/jobs)
+    config.eager_load_namespaces << Postal
 
     # Disable field_with_errors
     config.action_view.field_error_proc = Proc.new { |t, i| t }