PointerEvent Constructor in IE

We've just committed to implementing DOM Event Constructors in IE [1]. This work will include the PointerEvent constructor. Also note that we're working on the few other minor bugs that affect our test suite pass rate.  I don't yet know when we'll ship these, but I'll keep the group up to date.

Thanks!

-Jacob

[1] http://status.modern.ie/domeventconstructors