angular-ui/ui-select — pull request #287 by dimirc (2014-10-10 00:04:40+00:00)
Title: Show x icon to clear/reset the current value (like select2)

Demo:
http://plnkr.co/edit/qCx9MRvgNIuGAx0ljIP4?p=preview

PD: only working on select2 theme