Gdrive optional

cps/web.py

@@ -1,6 +1,11 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-from pydrive.auth import GoogleAuth
+try:
+    from pydrive.auth import GoogleAuth
+    from googleapiclient.errors import HttpError
+    gdrive_support= True
+except ImportError:
+    gdrive_support=False
 
 import mimetypes
 import logging
@@ -56,8 +61,6 @@ import io
 import hashlib
 import threading
 
-from googleapiclient.errors import HttpError
-
 from tornado import version as tornadoVersion
 
 try: