Enforce "en" lang in tests.

Some tests compare the result to english strings.

Do not test UnixCommandExecutor on Windows.

PharTest: explain why PHAR writing test are skipped.

InstallCommandTest: mock checkRequirements to allow the tests to run.

Run php_parallel_lint before all other tests.

Close #846

Tests/PHPCI/Model/ProjectTest.php

@@ -1,13 +1,15 @@
 <?php
+
 /**
  * PHPCI - Continuous Integration for PHP
  *
  * @copyright    Copyright 2014, Block 8 Limited.
- * @license        https://github.com/Block8/PHPCI/blob/master/LICENSE.md
- * @link            http://www.phptesting.org/
+ * @license      https://github.com/Block8/PHPCI/blob/master/LICENSE.md
+ * @link         https://www.phptesting.org/
  */
 
-namespace PHPCI\Model\Tests;
+
+namespace Tests\PHPCI\Model;
 
 use PHPCI\Model\Project;
 use PHPCI\Model;