Creates new page @ /ui/mobile.html for generating a QR code that
embeds configuration data for setting up mobile clients.
Imports code.google.com/p/rsc/{gf256,qr} version:
parent: 149:a3cbaf2339c4 tip
This addresses the server and web components of
https://camlistore.org/issue/372
Change-Id: If9239dd138707080afd7dedb5770d04893cbf0ba
Bill Thiede