Use pushd and popd; also use call
Use pushd and popd; also use call

And while were at it, Adding readme.md (dece0a5) also fixes vapoursynth/#451
vapoursynth/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth,Kamekameha/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth