Hardware platform (rev B) for Eyewriter 2.1

Second iteration of a hardware platform to support the new Eyewriter 2.1 open-source eye-tracking system.

For more information about the Eyewriter project in general, visit the official site at http://eyewriter.org/

For more information abut the Eyewriter 2.1 update that I am working on, check out all of my blog posts related to it: http://jason-webb.info/tag/eyewriter-2-1/

I am also maintaining a condensed wiki page for the project, here: http://jason-webb.info/wiki/index.php?title=Ey