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

pipeline optimize

do not fail on opencv 2.x

Fix bug for convolution on x86

update android.toolchain.cmake

Merge pull request Tencent#3 from zuyu/shell-scrip-execute-perm

Added the execute permission to the shell scrips.