angular-ui/ui-router — pull request #617 by Voles (2013-11-29 08:33:57+00:00)
Title: fix(uiSref): Add left-button detection support for IE8

This fixes the left mouse button detection for IE8.

For reference, see [PPK - Which mouse button has been clicked](http://www.quirksmode.org/js/events_properties.html#button).