[TO SQUASH] missed import

Part of #20

Author: ligurio

lib/app_server.py

@@ -23,6 +23,7 @@
 from .utils import find_port
 from .utils import format_process
 from .utils import warn_unix_socket
+from .utils import signame
 from .test import TestRunGreenlet, TestExecutionError
 from threading import Timer
 

lib/worker.py

@@ -7,6 +7,7 @@
 import signal
 import traceback
 import yaml
+import six
 from datetime import datetime
 
 from . import Options