Adding the datasheet for the gyroscope and the design checklist for the XMega A
Update to the I2C Library to provide a generic write / read function
that supports timeouts.

Signed-off-by: Dominic Baratta <dbaratta@buffalo.edu>
Starting work on the flight interface

Signed-off-by: Dominic Baratta <dbaratta@buffalo.edu>
Merge branch 'master' of git@github.com:dbaratta/XMegaUAV.git