Merge tag '0.3.5' into develop

0.3.5 (2018-01-07)
------------------

- Smarter BACKEND_URL in frontend

api/funkwhale_api/__init__.py

 # -*- coding: utf-8 -*-
-__version__ = '0.3.4'
+__version__ = '0.3.5'
 __version_info__ = tuple([int(num) if num.isdigit() else num for num in __version__.replace('-', '.', 1).split('.')])