Implement GPS

[Doomfest]

Implement the GPS code and integrate it with netwoking prototcol.

[Doomfest]

This is mostly done. Waiting for protocol between GPS and the data we want to get.

[msnidal]

Need to verify status of this code and look at integrating with @mhamid91

[tamarindd]

@infinitgrowth

[mhamid91]

The code for GPS and temperature/voltage sensors is already implemented. We need a protocol for the rover to communicate with the arduino to ask for sensor reading and/or send driving commands. you can look at my comments in ucode.ino to see what I did.