Add skip_before_action and skip_action_callback

lib/brakeman/checks/check_skip_before_filter.rb

@@ -14,7 +14,7 @@ class Brakeman::CheckSkipBeforeFilter < Brakeman::BaseCheck
 
   def run_check
     tracker.controllers.each do |name, controller|
-      filter_skips = (controller[:options][:skip_before_filter] || []) + (controller[:options][:skip_filter] || [])
+      filter_skips = controller[:options].values_at(:skip_before_filter, :skip_filter, :skip_before_action, :skip_action_callback).compact.flatten(1)
 
       filter_skips.each do |filter|
         process_skip_filter filter, controller