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/LicenseElementTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace PharIo\Manifest;
+
+class LicenseElementTest extends \PHPUnit_Framework_TestCase {
+    /**
+     * @var LicenseElement
+     */
+    private $license;
+
+    protected function setUp() {
+        $dom = new \DOMDocument();
+        $dom->loadXML('<?xml version="1.0" ?><license xmlns="https://phar.io/xml/manifest/1.0" type="BSD-3" url="https://some.tld/LICENSE" />');
+        $this->license = new LicenseElement($dom->documentElement);
+    }
+
+    public function testTypeCanBeRetrieved() {
+        $this->assertEquals('BSD-3', $this->license->getType());
+    }
+
+    public function testUrlCanBeRetrieved() {
+        $this->assertEquals('https://some.tld/LICENSE', $this->license->getUrl());
+    }
+
+}