sdd a closing? event for the client

lib/z_k/z_k_event_machine/client.rb

@@ -18,7 +18,6 @@ class Client < ZK::Client::Base
       # @method on_connection_lost
       # @return [Deferred::Default]
       deferred_event :connection_lost
-
 
       # Registers a one-shot callback for the ZOO_CONNECTED_STATE event. 
       #
@@ -60,6 +59,11 @@ def initialize(host, opts={})
         register_default_event_handlers!
       end
 
+      # @private
+      def closing?
+        !!@closing
+      end
+
       # open a ZK connection, attach it to the reactor. 
       # returns an EM::Deferrable that will be called when the connection is
       # ready for use