build win; add dcfldd dd
fix 8dot3 file name error

1. fix 8dot3 file name error
2. reoorgnize subdir
3. fix mac bugs
add mac build/install

1. buid_mac.sh
2. install_mac.sh

note: no libzip under current mac version
add dd, fix cat error, fix md5sum error, fix u disk size on win
Merge pull request #8 from cmooony/master

fix build error, add dd, dcfldd
Merge pull request #9 from pengphei/master

[test]: add test readme and test scripts, fix issue #6
Merge remote-tracking branch 'keepod/master'