package android x86/x86_64 library

fix unaryop arm, fix Tencent#1241

comment++

Update README.md

fix load_param_bin, fix Tencent#732

implement the missing dequantize image on armv7, prefer neon-optimize…

…d 3-dim dequantize, fix Tencent#547

Fixed two typos (Tencent#466)

handle batchnorm scale_factor zero, fix Tencent#302

add "#include <float.h>"

code style changes