Update browser support info for IE10 and 11

As of IE10 and 11, some new features are now supported. These include:
- Web Workers (http://caniuse.com/#search=web workers)
- Web Sockets (http://caniuse.com/#search=web sockets)
- History API using pushState (http://caniuse.com/#search=session history)
- Hidden property (http://caniuse.com/#search=hidden)
- Drag and drop and XHR upload (http://caniuse.com/#search=hxr)
- Browser based file reading (http://caniuse.com/#search=file api)
- Drag files directly into your browser (http://caniuse.com/#search=file api)
- Simple class manipulation (http://caniuse.com/#search=classlist)
- dataset (data-* attributes) (http://caniuse.com/#search=dataset)
- Offline detection (tested the demo in IE11... works perfectly)
- Offline application using the manifest (http://caniuse.com/#search=manifest)