Option to export projects to Android and/or iOS

It would be really cool if students could generate links to install their projects as Android or iOS apps on a phone or tablet. The app would be a web view, wrapped as an application with a set of generated files.

Concerns:
- The set of available events would be much smaller. It may be that we should simplify the event model anyway to include just mouse moves, clicks, and drags.
- iOS might not be possible without the student either jailbreaking or getting a $100 developer license. Android would require enabling third-party apps.