[enh] py3 compatibility

searx/url_utils.py

@@ -0,0 +1,28 @@
+from sys import version_info
+
+if version_info[0] == 2:
+    from urllib import quote, quote_plus, unquote, urlencode
+    from urlparse import parse_qsl, urljoin, urlparse, urlunparse, ParseResult
+else:
+    from urllib.parse import (
+        parse_qsl,
+        quote,
+        quote_plus,
+        unquote,
+        urlencode,
+        urljoin,
+        urlparse,
+        urlunparse,
+        ParseResult
+    )
+
+
+__export__ = (parse_qsl,
+              quote,
+              quote_plus,
+              unquote,
+              urlencode,
+              urljoin,
+              urlparse,
+              urlunparse,
+              ParseResult)