[Tabset] Add parameter to nb-route-tabset to sticky at top

[JavierFuentes]

Issue type

I'm submitting a ...

• bug report
• feature request

Issue description

Current behavior:
nb-route-tabset doesn't sticky at top and scrolls with all his content.

Expected behavior:
I expect nb-route-tabset can sticky at top with a new parameter to control this behaviour and show all his content in a vertical scrollable div with max available height in mobile and desktop.

[denisobrienirl]

Folks,

While you're at it, may i suggest to also implement a tab close mechanism. Like, an option to have an 'X' on the tab and when pressed will emit a onClose event or something similar.
I got it added to nb-route-tabset component manually, but have to re-apply after each RC upgrade :(

This is how it looks in my simple implementation:

Thanks! Keep up the good work!

[nnixaa]

Hey @JavierFuentes, that totally makes sense, labeled as an enhancement.

@denisobrienirl, thanks for the suggestion, let's track it here #288.