Added test-ffi target, use it in CI (#9)

* Added test-ffi target, use it in CI

* Added clang-format config, fixed RETURN_STRING API mismatch

* Skip installing php and packages on the PHP docker images

* Removed al2 job that was never going to work, and compiler tests

* Fixed basic test for extension loading

* Cleaned up lib structure, fixed tests

* use test-ci target to conditionally test in GitHub

* Use v0.8.1 of builder

lib/tests/ErrorTest.php

@@ -1,7 +1,5 @@
 <?php
 
-require_once('tests.inc');
-
 final class ErrorTest extends PHPUnit_Framework_TestCase {
     private static $crt = null;
     public static function setUpBeforeClass() {