Allow access to the JID via #jid, fixes #496

lib/sidekiq/processor.rb

@@ -36,6 +36,7 @@ module Sidekiq
           msg = Sidekiq.load_json(msgstr)
           klass  = msg['class'].constantize
           worker = klass.new
+          worker.jid = msg['jid']
 
           stats(worker, msg, queue) do
             Sidekiq.server_middleware.invoke(worker, msg, queue) do

lib/sidekiq/worker.rb

@@ -24,6 +24,7 @@ module Sidekiq
     def self.included(base)
       base.extend(ClassMethods)
       base.class_attribute :sidekiq_options_hash
+      base.send(:attr_accessor, :jid)
     end
 
     def logger