Add pear modules, mail and net_smtp via composer (#93)

Add pear modules, mail and net_smtp via composer, remove php 5.6 build due to phpunit 6

lib/composer/vendor/symfony/event-dispatcher/EventDispatcherInterface.php

@@ -27,7 +27,7 @@ interface EventDispatcherInterface
      *                          the event is the name of the method that is
      *                          invoked on listeners.
      * @param Event  $event     The event to pass to the event handlers/listeners
-     *                          If not supplied, an empty Event instance is created.
+     *                          If not supplied, an empty Event instance is created
      *
      * @return Event
      */
@@ -48,8 +48,6 @@ interface EventDispatcherInterface
      *
      * The subscriber is asked for all the events he is
      * interested in and added as a listener for these events.
-     *
-     * @param EventSubscriberInterface $subscriber The subscriber
      */
     public function addSubscriber(EventSubscriberInterface $subscriber);
 
@@ -61,11 +59,6 @@ interface EventDispatcherInterface
      */
     public function removeListener($eventName, $listener);
 
-    /**
-     * Removes an event subscriber.
-     *
-     * @param EventSubscriberInterface $subscriber The subscriber
-     */
     public function removeSubscriber(EventSubscriberInterface $subscriber);
 
     /**