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/phpunit/phpunit-mock-objects/tests/MockBuilderTest.php

@@ -1,6 +1,6 @@
 <?php
 /*
- * This file is part of the PHPUnit_MockObject package.
+ * This file is part of the phpunit-mock-objects package.
  *
  * (c) Sebastian Bergmann <sebastian@phpunit.de>
  *
@@ -8,7 +8,10 @@
  * file that was distributed with this source code.
  */
 
-class Framework_MockBuilderTest extends PHPUnit_Framework_TestCase
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\MockObject\MockBuilder;
+
+class MockBuilderTest extends TestCase
 {
     public function testMockBuilderRequiresClassName()
     {
@@ -121,6 +124,6 @@ class Framework_MockBuilderTest extends PHPUnit_Framework_TestCase
                      ->disableOriginalClone()
                      ->disableAutoload();
 
-        $this->assertTrue($spec instanceof PHPUnit_Framework_MockObject_MockBuilder);
+        $this->assertTrue($spec instanceof MockBuilder);
     }
 }