request_visible_actions option support for g+

Hello,

This PR adds support for new g+ feature [moments insert](https://developers.google.com/+/api/latest/moments/insert). 

In order to insert moment original oauth request should include `request_visible_actions` (see [my question](http://stackoverflow.com/questions/15164949/google-unable-to-insert-moment) on stackoverflow).

Looking forward for comments.

Regards,
Alex