Return PDU instead of result code

lib/net/ldap/pdu.rb

@@ -112,6 +112,10 @@ class Net::LDAP::PDU
     @ldap_result || {}
   end
 
+  def error_message
+    result[:errorMessage] || ""
+  end
+
   ##
   # This returns an LDAP result code taken from the PDU, but it will be nil
   # if there wasn't a result code. That can easily happen depending on the
@@ -120,6 +124,10 @@ class Net::LDAP::PDU
     @ldap_result and @ldap_result[code]
   end
 
+  def status
+    result_code == 0 ? :success : :failure
+  end
+
   ##
   # Return serverSaslCreds, which are only present in BindResponse packets.
   #--