This post is part of the Who's @ Google I/O, a series of blog posts that give a closer look at developers who'll be speaking or demoing at Google I/O. This guest post is written by Adrian Graham, co-founder of nextstop.com who will give us a demo inside the Developer Sandbox. When building nextstop's HTML5 mobile app, we were able to leverage a powerful combination of HTML5 and Google API's to bui