Merge pull request #12 from felixonmars/master

fix non zero value with handling [ ! -z ${swapf[Poff]} ] && [ ! -z "${swapd[devs]}" ]
Merge pull request #13 from felixonmars/master

Fix: don't fail when there's no swapd
zram management using zramctl
fix bug: gluing data written through write()
Use autoclear instead of manual deatach loop device
fix 90-systemd-swap.conf so the comment will not be treated as params by modprobe