Growl should support Message's with arbitrary timeouts

[spyderz42]

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

What is the motivation / use case for changing the behavior?
It would be nice if the growl component would support arbitrary message timeouts. Instead of setting the growl to sticky or setting a timeout on it. You could specify this message should be sticky (error, user needs to see it), but this next message should have a 3second timeout (your save was successful), and this other one needs to hang around longer and should be here for 10 seconds.

Please tell us about your environment:

• Angular version: 4.0.X

• PrimeNG version: 2.0.X

• Browser: all

• Language: [TypeScript 2.1]

• Node (for AoT issues): node --version =

[cagataycivici]

Growl is deprecated, please use Toast instead which supports this.