Misc. changes to generate calib data and display scan data.
Added Rover scanning and plotting functionality.
Removed git reference to calibration data directory.
Merge branch 'master' of https://github.com/asr1/mars-rover into asr1-master
Moved song logic from the `mars-rover.c` to its own subsystem, `songs`.
Changed the value that was used to set the servo position to be a raw dpulse width rather than a pulse width proportion.
Fixed simple rover build errors.
Clarified scanning and mapping functionality of `Rover`.
Merge branch 'master' of https://github.com/dwtj/mars-rover