Android UCI engine update: Stockfish dev't 2017.08.31.ACH

Yesterday's code base compiled by Alexei for Android. There's one day delay and we are still not as quick as we should be (...smile here because i'm slowly joking a lil' bit).

GET Stockfish 8.0.2017.08.31.ACH for arm7 and arm8

In case of trouble downloading from your PC, use your mobile device or refer to THIS POST.