Severity support for SplitButton

[Olmer1st]

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

Hi,

Can you implement same Severity theming for splitbutton like for regular button.
.ui-button-secondary
.ui-button-success
.ui-button-info
.ui-button-warning
.ui-button-danger

Thanks

[sudheerj]

This is not going to be complex thing.Normally only plain buttons will be used with severity.But this can be considered based on demand from user point of view :)

[Olmer1st]

Great! I thought it already work and was disappointed when checked.