Removed forgotten import

warden3/warden_server/warden_server.py

@@ -23,7 +23,6 @@ from time import sleep
 from urlparse import parse_qs
 from os import path
 from random import randint
-from contextlib import closing
 
 # for local version of up to date jsonschema
 sys.path.append(path.join(path.dirname(__file__), "..", "lib"))