[!!!][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.

tests/Pecee/SimpleRouter/Dummy/DummyController.php

@@ -16,6 +16,11 @@ class DummyController
     public function method2()
     {
 
+    }
+
+    public function method3()
+    {
+        return 'method3';
     }
 
 	public function param($params = null)