feedly cloud api

https://developer.feedly.com/v3/mixes/
http://feedly.com/i/discover
https://gist.github.com/d3m3vilurr/5904029
http://qiita.com/kawaz/items/5f03dde3c219bdbffc3b


https://sandbox.feedly.com/v3/mixes/contents?streamId=topic/news