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/console/Input/InputOption.php

@@ -33,8 +33,6 @@ class InputOption
     private $description;
 
     /**
-     * Constructor.
-     *
      * @param string       $name        The option name
      * @param string|array $shortcut    The shortcuts, can be null, a string of shortcuts delimited by | or an array of shortcuts
      * @param int          $mode        The option mode: One of the VALUE_* constants
@@ -195,8 +193,6 @@ class InputOption
     /**
      * Checks whether the given option equals this one.
      *
-     * @param InputOption $option option to compare
-     *
      * @return bool
      */
     public function equals(InputOption $option)