New Flexbox layout for Vertical Tabs, Tabs...

**_On Hold**_
Waiting for answer on [stackoverflow](http://stackoverflow.com/questions/39918999/can-i-do-the-following-with-flex-order)

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Create a flexbox layout that can:
- Be under section title on desktop.
- Be under vertical-tab/tab/slideshow on mobile

A visualization:

![flex-order](https://cloud.githubusercontent.com/assets/10474405/19213317/b46e9e8c-8d9b-11e6-82dc-69c1e5e9de80.png)
