Merge pull request #301 from oligriffiths/patch/json-partial-output

Added JSON_PARTIAL_OUTPUT_ON_ERROR to json_encode to handle recursive stack traces

src/Whoops/Handler/JsonResponseHandler.php

@@ -84,7 +84,8 @@ class JsonResponseHandler extends Handler
             header('Content-Type: application/json');
         }
 
-        echo json_encode($response);
+        echo json_encode($response, defined('JSON_PARTIAL_OUTPUT_ON_ERROR') ? JSON_PARTIAL_OUTPUT_ON_ERROR : 0);
+
         return Handler::QUIT;
     }
 }