fix sessions in cookies for python3

gluon/globals.py

@@ -1167,7 +1167,7 @@ class Session(Storage):
                              compression_level=compression_level)
         rcookies = response.cookies
         rcookies.pop(name, None)
-        rcookies[name] = value
+        rcookies[name] = value.decode('utf8')
         rcookies[name]['path'] = '/'
         expires = response.session_cookie_expires
         if isinstance(expires, datetime.datetime):

gluon/utils.py

@@ -207,6 +207,8 @@ def secure_dumps(data, encryption_key, hash_key=None, compression_level=None):
 
 
 def secure_loads(data, encryption_key, hash_key=None, compression_level=None):
+    if not isinstance(data, bytes):
+        data = bytes(data, 'utf8')
     components = data.count(b':')
     if components == 1:
         return secure_loads_deprecated(data, encryption_key, hash_key, compression_level)