W3C pointer support

Hi Matteo,

as discussed this PR adds support for W3C pointer events. Currently this can be tested on IE11, with FF if the flag is activated in the config or with a polyfill like hand.js 

Spec: http://www.w3.org/TR/pointerevents/

Impl: I added a util function for the binding/unbinding because indicator and core will need this code both. Other then that the eventing is treated like the prefixed microsoft.

Regards,
Damien