Adds stylemedia back

[orta]

StyleMedia is used in React's types

[saschanaz]

I'm not sure why it's used and for what. It doesn't exist anywhere. If it only uses the type but not the value, maybe noInterfaceObject: true and deprecated?

[saschanaz]

Just took a look at React types. It's used in interface AbstractView which seems to be mocking window with only two properties. Since window.styleMedia only existed in IE11 and nowhere else, it should not exist there. And it only uses the type, so I guess #113 (comment) should be acceptable.

[orta]

OK, this is rebased, commented and updated with feedback

[saschanaz]

Thanks!