[Advice] Tabs fill and justify

[justforuse]

Not bug, just my advice.

For now, bootstrap4 has already supported tabs fill and justify, Here is the link: http://v4-alpha.getbootstrap.com/components/navs/#fill-and-justify

And you can just add .nav-fill class on ngb-tabset to make tabs justified, Here is the plnkr:
http://plnkr.co/edit/4q7RdiwhTMPtbjnq9leW?p=preview , it performs well.

Maybe it's better to add 'fill' or other words to NgbTabsetConfig.justify, while it only support 'start', 'end' and 'center'

Thanks a lot

[pkozlowski-opensource]

Related #1239

[Adondriel]

Just, info for anyone else using the Tabs, if you set a tab's [id] value to an object, it ACTUALLY WORKS on the tab change event.(Might be nice to add this info to the documentation) I was blown away when I figured this out.

[justforuse]

@Adondriel sorry I don't get it.. is this related to this issue? what does tab's [id] do?