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/Tests/Fixtures/FooOptCommand.php

@@ -0,0 +1,36 @@
+<?php
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class FooOptCommand extends Command
+{
+    public $input;
+    public $output;
+
+    protected function configure()
+    {
+        $this
+            ->setName('foo:bar')
+            ->setDescription('The foo:bar command')
+            ->setAliases(array('afoobar'))
+            ->addOption('fooopt', 'fo', InputOption::VALUE_OPTIONAL, 'fooopt description')
+        ;
+    }
+
+    protected function interact(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln('interact called');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $this->input = $input;
+        $this->output = $output;
+
+        $output->writeln('called');
+        $output->writeln($this->input->getOption('fooopt'));
+    }
+}