[!!!][FEATURE] Removed php-di as suggested by #477

NOTE: Custom class-loader should be used to create custom integrations with frameworks like php-di. See documentation for more information.

- Removed all references to php-cli from composer + code.
- Added ClassLoader php-unit tests.

src/Pecee/SimpleRouter/Router.php

@@ -306,7 +306,7 @@ class Router
      *
      * @return string|null
      * @throws NotFoundHttpException
-     * @throws TokenMismatchException
+     * @throws \Pecee\Http\Middleware\Exceptions\TokenMismatchException
      * @throws HttpException
      * @throws \Exception
      */