Merge pull request bottlepy#483 from denik/unused_import

remove unused import: urllib

bottle.py

@@ -36,7 +36,7 @@
         import gevent.monkey; gevent.monkey.patch_all()
 
 import base64, cgi, email.utils, functools, hmac, imp, itertools, mimetypes,\
-        os, re, subprocess, sys, tempfile, threading, time, urllib, warnings
+        os, re, subprocess, sys, tempfile, threading, time, warnings
 
 from datetime import date as datedate, datetime, timedelta
 from tempfile import TemporaryFile