noink and others don't work on IE10

[0x24a537r9]

"pointer-events: none;" doesn't work in IE10 (http://caniuse.com/#search=CSS%20pointer-events) and is used in multiple places (most obviously in noink mode). Is that alright? I don't know the intended support profile of Polymer components with the polyfills and such.

[David-Mulder]

Polymer supports the latest version of evergreen browsers, now it's a bit messy what that means in regards to older windows versions (as windows vista and earlier does not support IE10+), but practically nobody should have IE10 right now, as everybody on Windows 7+ should have received an update to IE11. So, point in case, Polymer doesn't care about IE10.