Custom content support for TabMenu

[rachelbr]

I'm submitting a ... (check one with "x")

[ ] bug report => Search github for a similar issue or PR before submitting
[ x] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Plunkr Case (Bug Reports)

Current behavior
In TabMenu component there is no closeable ability for each tab
Expected behavior
I'm using prime 4 for angular
Could you add same functionality as tabview has to tabmenu? For example ability to close tabs
Following for #688
Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

ggPlease tell us about your environment:

windows

• Angular version: 4.0.X

• PrimeNG version: 4.0.X

• Browser: [all | Chrome XX | Firefox XX | IE 11| Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

Chrome XX | IE 11

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  TypeScript
• Node (for AoT issues): node --version =

[rachelbr]

mayby also nice to have customer option to decide for the active tab after closing
(nextTab if exist, previos ...)

[rfreydi]

Up, no news if this feature will be added ?

[istephielicious]

Up, waiting for this feature to be implemented :)

[cagataycivici]

If we add custom content support via templating then it would be easier so that an X icon can be added with the functionality you can bind.