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/Event/ConsoleCommandEvent.php

@@ -25,8 +25,6 @@ class ConsoleCommandEvent extends ConsoleEvent
 
     /**
      * Indicates if the command should be run or skipped.
-     *
-     * @var bool
      */
     private $commandShouldRun = true;