Fixing Google Private IP OAuth rejection

Fixes #47 . New instructions look like respectively:

![google_solution1](https://cloud.githubusercontent.com/assets/8046159/4846373/5e9244fc-604b-11e4-9fbd-315f6e3de942.jpg)
![google_solution2](https://cloud.githubusercontent.com/assets/8046159/4846374/5e9331aa-604b-11e4-955d-91fec1370099.jpg)


Localhost is a special case as Google allows it.