Revised BMS 2013

Major changes:
Changed Pin outputs on NU32 (namely moved current sensors to ADCs and
moved the override switches down)
Removed most of the isolation and consolidated most grounds and power
Added Logic shifters
Added FTDI pinouts
Replaced Current Sensors with Tamura that doesn't require external
capacitors
Replaced LTC6803 with LTC6804-1 and added required hardware to support
it (namely the LTC6820 and the Transformers)
note: LTC6804-1 communicates over SPI and the LTC6820 converts that to
isoSPI for less communcation noise
Merge branch 'master' of https://github.com/nusolar/sc6-electrical-design