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/ExtensionElementTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace PharIo\Manifest;
+
+class ExtensionElementTest extends \PHPUnit_Framework_TestCase {
+    /**
+     * @var ExtensionElement
+     */
+    private $extension;
+
+    protected function setUp() {
+        $dom = new \DOMDocument();
+        $dom->loadXML('<?xml version="1.0" ?><extension xmlns="https://phar.io/xml/manifest/1.0" for="phar-io/phive" compatible="~0.6" />');
+        $this->extension = new ExtensionElement($dom->documentElement);
+    }
+
+    public function testNForCanBeRetrieved() {
+        $this->assertEquals('phar-io/phive', $this->extension->getFor());
+    }
+
+    public function testCompatibleVersionConstraintCanBeRetrieved() {
+        $this->assertEquals('~0.6', $this->extension->getCompatible());
+    }
+
+}