should expose some of the platform properties, like "isMobile"

[blairmacintyre]

If we're going to compute things about the platform, they should be exposed somehow.

Things that would be useful

• isMobile
• OS (iOS, android, windows, etc)
• phone or tablet or laptop or desktop (whatever you can tell)
• platform supports location
• platform supports orientation
• mouse or touch

Probably other things.

Anything else?