Make skipping the verify_authenticity_token action optional

This prevents the skip from raising an exception if it is not defined,
and since it doesn't appear to be defined in a Rails 5 app this is
helpful.

Author: csexton

lib/kracken/controllers/json_api_compatible.rb

@@ -126,7 +126,7 @@ def self.included(base)
           extend Macros
 
           before_action :munge_chained_param_ids!
-          skip_before_action :verify_authenticity_token
+          skip_before_action :verify_authenticity_token, raise: false
 
           if defined?(::ActiveRecord)
             rescue_from ::ActiveRecord::RecordNotFound do |error|