Context emulator working; swipe broken

Somehow, swipe broke. Now when the page first loads, the containers are
40 pixels wider than they should be, but when the orientation changes
it gets the right width. Something is happening out of order, I
presume. The code needs to be cleaned up anyway, so that will be the
next step.
FInalized device emulator; added mini live example

Swipe still not working
Reorganized emulator menu between contexts

Small design changes: thicker borders, transparent orange "Try It",
100% wide green highlight, padding around the logo, darker checkboard
pattern, removed device preview