fixed a bug with low battery detection caused by a faulty conversion from avr_voltage to raw band gap values
saved 10 bytes by reading ADC directly instead of joining ADCL and ADCH in read_avr_voltage
updated get_avr_voltage/band gap code documentation
Merge remote-tracking branch 'whb/master'
re-enabled print_number by default
removed some extra printing in functional
mentioned a possible use of low_voltage_state in the header file
finished converting low_voltage_detection from avr_voltage to band_gap_reading
more doc formatting
Merge branch 'master' of https://github.com/dhiltonp/hexbright