Re: [csswg-drafts] [css-grid] Stretching image grid items in both dimensions

I think this will be a common situation for 
developers([demo](http://jsbin.com/cavorevihe/edit?html,output)).

![image](https://cloud.githubusercontent.com/assets/2784308/20780840/50096ba0-b7b9-11e6-88bc-1986ccd762a4.png)

And I was surprised to find that Chrome was not in the same height.

![image](https://cloud.githubusercontent.com/assets/2784308/20780889/b7cd643a-b7b9-11e6-82eb-8c3052aed548.png)


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