merged branch hhamon/sendevent_unused_property (PR swiftmailer#155)

Commits
-------

f77f8b0 [Events] removed unused $_transport property and renamed $result to $_result property in SendEvent class.

Discussion
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[Events] removed unused $_transport property and renamed $result to $_re...

...sult property in SendEvent class.

lib/classes/Swift/Events/SendEvent.php

@@ -36,12 +36,6 @@ class Swift_Events_SendEvent extends Swift_Events_EventObject
    */
   private $_message;
 
-  /**
-   * The Transport used in sending.
-   * @var Swift_Transport
-   */
-  private $_transport;
-
   /**
    * Any recipients which failed after sending.
    * @var string[]
@@ -52,7 +46,7 @@ class Swift_Events_SendEvent extends Swift_Events_EventObject
    * The overall result as a bitmask from the class constants.
    * @var int
    */
-  private $result;
+  private $_result;
 
   /**
    * Create a new SendEvent for $source and $message.