msvc支持
去掉不需要的文件
use array.h for dynarray
ppm/pgm document
ppm/pgm document
msvc下的可变长数组改用_alloca实现
Merge pull request #37 from actboy168/array

msvc下的可变长数组改用_alloca实现
Merge remote-tracking branch 'origin/cloudwu-master'