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/TestToto.php

@@ -0,0 +1,22 @@
+<?php
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class TestToto extends Command
+{
+    protected function configure()
+    {
+        $this
+            ->setName('test-toto')
+            ->setDescription('The test-toto command')
+            ->setAliases(array('test'))
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->write('test-toto');
+    }
+}