TabView component for Brick 2.0

[fwenzel]

https://bugzilla.mozilla.org/show_bug.cgi?id=1039481

The mortar tab view template needs to be able to create this, maybe not in one component, but certainly with the help of a tab bar and associated cards.

[potch]

Not sure what this component is, other than combining a tabbar and a deck.

[fwenzel]

sounds about right; if that's done, close this and the bugzilla bug? <3

[dotch]

something like this? (watch at maximum 767px width)
http://mozbrick.github.io/examples/brick-layout/tabs.html
(old demo, and currently only at small screen size a tabbar but i think you can get the idea..)