Don't write state information into metadata from engine as all the actual state is now in compiler

app/Engine/Engine.php

@@ -91,10 +91,8 @@ class Engine
 		$documents = array_values($documents);
 
 		// Pass it all in and compile
-		$document = $this->compileDocuments($documents, $options);
-
-		// Set metadata in output
-		$document->setChildByPath('Metadata.Stack', $files);
+		$this->compileDocuments($documents, $options);
+		$document = $this->getOutputDocument();
 
 		// Remove cfnpp block, that doesn't go to CloudFormation
 		$cfnpp = $document->getChildByName('cfnpp');