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/Style/StyleInterface.php

@@ -34,8 +34,6 @@ interface StyleInterface
 
     /**
      * Formats a list.
-     *
-     * @param array $elements
      */
     public function listing(array $elements);
 
@@ -83,9 +81,6 @@ interface StyleInterface
 
     /**
      * Formats a table.
-     *
-     * @param array $headers
-     * @param array $rows
      */
     public function table(array $headers, array $rows);