Add Google as an elsewhere. fixes #32

Google doesn't provide a unique username, so we're left with no choice but to use `id` for now. 

![google2](https://cloud.githubusercontent.com/assets/3893573/4348424/d5aa7eae-418a-11e4-8729-262bca2b646c.png)

Screenshots : 

![google1](https://cloud.githubusercontent.com/assets/3893573/4348425/e5815154-418a-11e4-87be-d2b5a717c352.png)
![google3](https://cloud.githubusercontent.com/assets/3893573/4348426/e58f19ce-418a-11e4-8d84-f844331ee730.png)
![google4](https://cloud.githubusercontent.com/assets/3893573/4348427/e59389dc-418a-11e4-89a5-a1c3963ea9d3.png)