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/phar-io/manifest/tests/xml/ExtElementTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace PharIo\Manifest;
+
+class ExtElementTest extends \PHPUnit_Framework_TestCase {
+    /**
+     * @var ExtElement
+     */
+    private $ext;
+
+    protected function setUp() {
+        $dom = new \DOMDocument();
+        $dom->loadXML('<?xml version="1.0" ?><ext xmlns="https://phar.io/xml/manifest/1.0" name="dom" />');
+        $this->ext = new ExtElement($dom->documentElement);
+    }
+
+    public function testNameCanBeRetrieved() {
+        $this->assertEquals('dom', $this->ext->getName());
+    }
+
+}