Publish from G+

[renfeng]

List publicly shared posts just like frisbee

https://developers.google.com/+/web/api/rest/latest/activities/list

GET https://www.googleapis.com/plus/v1/people/100160462017014431473/activities/public?key={YOUR_API_KEY}

[renfeng]

content availability, especially for China, depends on issue #5