Call load_types_in after necessary class methods are defined.

Loaded subclasses need them.

This should fix #502.

app/models/agent.rb

@@ -18,8 +18,6 @@ class Agent < ActiveRecord::Base
 
   markdown_class_attributes :description, :event_description
 
-  load_types_in "Agents"
-
   SCHEDULES = %w[every_1m every_2m every_5m every_10m every_30m every_1h every_2h every_5h every_12h every_1d every_2d every_7d
                  midnight 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am noon 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm never]
 
@@ -406,6 +404,9 @@ class Agent < ActiveRecord::Base
     end
     handle_asynchronously :async_check
   end
+
+  # Finally load all agent classes after necessary class methods are defined.
+  load_types_in "Agents"
 end
 
 class AgentDrop