Added functionality to use Mixin::RailsLogger as singleton class method.

lib/mixin/rails_logger.rb

@@ -1,9 +1,16 @@
 module Mixin
   module RailsLogger
+    # add logger method for instance method access
     extend Forwardable
     extend SingleForwardable
 
     instance_delegate [:logger] => self
     single_delegate   [:logger] => :Rails
+
+    # add logger method for class method access
+    def self.included(base)
+      base.extend(SingleForwardable)
+      base.single_delegate [:logger] => :Rails
+    end
   end
 end