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/Output/ConsoleOutput.php

@@ -29,14 +29,9 @@ use Symfony\Component\Console\Formatter\OutputFormatterInterface;
  */
 class ConsoleOutput extends StreamOutput implements ConsoleOutputInterface
 {
-    /**
-     * @var StreamOutput
-     */
     private $stderr;
 
     /**
-     * Constructor.
-     *
      * @param int                           $verbosity The verbosity level (one of the VERBOSITY constants in OutputInterface)
      * @param bool|null                     $decorated Whether to decorate messages (null for auto-guessing)
      * @param OutputFormatterInterface|null $formatter Output formatter instance (null to use default OutputFormatter)