Support for xz-compressed Python tarballs (fixes #177)
Support for xz-compressed Python tarballs (fixes #177)

VShangxiao/pyenv,recruit-mtl/pyenv,zmwangx/pyenv,sebhahn/pyenv,xshwy/pyenv,genome-vendor/pyenv,yyuu/pyenv,fly19890211/pyenv,pyenv/pyenv,kevinburke/pyenv,sebhahn/pyenv,hlecuanda/pyenv,yeonsh/pyenv,yeonsh/pyenv,rowhit/pyenv,lozybean/pyenv,syndbg/goenv,xshwy/pyenv,sebhahn/pyenv,hlecuanda/pyenv,chenfengyuan/pyenv,dongguangming/pyenv,syndbg/goenv,fly19890211/pyenv,lepture/pyenv,pyenv/pyenv,kevinburke/pyenv,BanzaiMan/pyenv,zmwangx/pyenv,syndbg/goenv,habinmusic/pyenv,habinmusic/pyenv,BanzaiMan/pyenv,VShangxiao/pyenv,cehoffman/pyenv,dongguangming/pyenv,yyuu/pyenv,chenfengyuan/pyenv,rowhit/pyenv,lepture/pyenv,obimod/pyenv,takluyver/pyenv,obimod/pyenv,recruit-mtl/pyenv,cehoffman/pyenv,syndbg/goenv,takluyver/pyenv,dnsd/pyenv,lozybean/pyenv,UCASREN/pyenv,genome-vendor/pyenv,UCASREN/pyenv,dnsd/pyenv,pyenv/pyenv