RevF-Version-2
This version is intended only for revision F4 and F5 Printrboards.
As compared to the previous version, implements a change to the bed thermistor (requested by Nick @ PBHQ), consolidates build dimensions and steps/mm to values compatible with current production models (build area must be updated for models other than the Play)
Also, for convenience - provides useful revision information in the M115 response (this version number, and URL to github repository).