Fix a misplaced __future__ import.

Fixes #66.

oauth2client/tools.py

@@ -19,11 +19,11 @@ generated credentials in a common file that is used by other example apps in
 the same directory.
 """
 
+from __future__ import print_function
+
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 __all__ = ['argparser', 'run_flow', 'run', 'message_if_missing']
 
-from __future__ import print_function
-
 import argparse
 import BaseHTTPServer
 import logging