Python 3 fixes

flask_admin/_compat.py

@@ -32,7 +32,7 @@ if not PY2:
 
     # Various tools
     from functools import reduce
-    from urllib.parse import urljoin
+    from urllib.parse import urljoin, urlparse
 else:
     text_type = unicode
     string_types = (str, unicode)
@@ -50,7 +50,7 @@ else:
 
     # Helpers
     reduce = __builtins__['reduce'] if isinstance(__builtins__, dict) else __builtins__.reduce
-    from urlparse import urljoin
+    from urlparse import urljoin, urlparse
 
 
 def with_metaclass(meta, *bases):

flask_admin/helpers.py

 from re import sub
-from urlparse import urlparse, urljoin
 from jinja2 import contextfunction
 from flask import g, request
 from wtforms.validators import DataRequired, InputRequired
 
+from flask.ext.admin._compat import urljoin, urlparse
+
 
 from ._compat import string_types