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/GenericEvent.php

@@ -20,24 +20,13 @@ namespace Symfony\Component\EventDispatcher;
  */
 class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
 {
-    /**
-     * Event subject.
-     *
-     * @var mixed usually object or callable
-     */
     protected $subject;
-
-    /**
-     * Array of arguments.
-     *
-     * @var array
-     */
     protected $arguments;
 
     /**
      * Encapsulate an event with $subject and $args.
      *
-     * @param mixed $subject   The subject of the event, usually an object
+     * @param mixed $subject   The subject of the event, usually an object or a callable
      * @param array $arguments Arguments to store in the event
      */
     public function __construct($subject = null, array $arguments = array())
@@ -63,7 +52,7 @@ class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
      *
      * @return mixed Contents of array key
      *
-     * @throws \InvalidArgumentException If key is not found.
+     * @throws \InvalidArgumentException if key is not found
      */
     public function getArgument($key)
     {
@@ -80,7 +69,7 @@ class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
      * @param string $key   Argument name
      * @param mixed  $value Value
      *
-     * @return GenericEvent
+     * @return $this
      */
     public function setArgument($key, $value)
     {
@@ -104,7 +93,7 @@ class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
      *
      * @param array $args Arguments
      *
-     * @return GenericEvent
+     * @return $this
      */
     public function setArguments(array $args = array())
     {
@@ -132,7 +121,7 @@ class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
      *
      * @return mixed
      *
-     * @throws \InvalidArgumentException If key does not exist in $this->args.
+     * @throws \InvalidArgumentException if key does not exist in $this->args
      */
     public function offsetGet($key)
     {