Update dependencies

[noyainrain]

to jessie:

• Python 2.7 (maybe 3.4)
• Tornado 3.2
• Redis 2.10
• redis-py 2.10
• websocket 0.18 (maybe obsolete)

[noyainrain]

Interesting Tornado stuff:

• http://www.tornadoweb.org/en/branch3.2/netutil.html#tornado.netutil.Resolver
• http://www.tornadoweb.org/en/branch3.2/log.html#module-tornado.log
• http://www.tornadoweb.org/en/branch3.2/concurrent.html#module-tornado.concurrent
• http://www.tornadoweb.org/en/branch3.2/testing.html#tornado.testing.bind_unused_port
• http://www.tornadoweb.org/en/branch3.2/websocket.html#tornado.websocket.websocket_connect
• http://www.tornadoweb.org/en/branch3.2/gen.html#module-tornado.gen
• RequestHandler.current_user
• http://www.tornadoweb.org/en/branch3.2/web.html#tornado.web.RequestHandler.write_error
• http://www.tornadoweb.org/en/branch3.2/ioloop.html#tornado.ioloop.IOLoop.handle_callback_exception
• https://docs.python.org/3/library/asyncio.html
• https://aiohttp.readthedocs.org/en/v0.15.3/