Minor changes

tests/pure_runner.php

@@ -0,0 +1,24 @@
+<?php
+
+    use RTEX\Classes\InstructionBuilder;
+    use RTEX\Engine;
+    use RTEX\Objects\Program;
+
+    require 'ncc';
+
+    import('net.nosial.rtex', 'latest');
+
+    $program = new Program();
+
+    $program->getMain()->addInstruction(InstructionBuilder::set('foo', 'bar'));
+    $program->getMain()->addInstruction(InstructionBuilder::set('bar', 500));
+
+    $program->getMain()->addInstruction(InstructionBuilder::set('results',
+        InstructionBuilder::sum(
+            500,
+            InstructionBuilder::get('bar')
+        )
+    ));
+
+    $engine = new Engine($program);
+    $engine->run();