Merge pull request #25 from aethaniel/zero

cores/arduino/wiring_analog.c

cores/arduino/wiring_analog.h

cores/validation/validation_core/build_as6/test.cppproj

cores/validation/validation_core/test - Copy.cpp

cores/validation/validation_core/test.cpp

variants/arduino_zero/variant.cpp

variants/arduino_zero/variant.h