Imported CRT FFI lib (#7)

* Added php7 library skeleton

* Re-worked Makefile.frag to use paths correctly

* Added gitignore for lib

* clang-format

* Remove symlinked api.h

* Copy api.h into lib/ as part of build

lib/test.php

@@ -0,0 +1,7 @@
+<?php
+require_once('crt.php');
+
+$crt = new CRT();
+$crt->init();
+var_dump($crt->error_name(0));
+$crt->clean_up();