Get home dir using `user.Current()` if `HOME` env var is not set
Get home dir using `user.Current()` if `HOME` env var is not set

This is to fix Windows related home dir issue https://github.com/github/hub/issues/772
nmfzone/hub,terry2000/hub,hb9kns/hub,AndBicScadMedia/hub,github/hub,nmfzone/hub,whilp/hub,pcorpet/hub,pcorpet/hub,github/hub,terry2000/hub,github/hub,jingweno/hub,elancom/hub,rlugojr/hub,cpick/hub,naru0504/hub,hopil/hub,hopil/hub,RichardLitt/hub,sbp/hub,codydaig/hub,nmfzone/hub,RichardLitt/hub,tomasv/hub,xantage/hub,jpkrohling/hub,sbp/hub,codydaig/hub,SanCoder-Q/hub,nlutsenko/hub,naru0504/hub,sbp/hub,dongjoon-hyun/hub,boris-rea/hub,isundaylee/hub,aereal/hub,AndBicScadMedia/hub,pankona/hub,ASidlinskiy/hub,whilp/hub,SanCoder-Q/hub,xantage/hub,dongjoon-hyun/hub,AndBicScadMedia/hub,cpick/hub,jpkrohling/hub,pankona/hub,aspiers/hub,jpkrohling/hub,ryo33/hub,tomasv/hub,boris-rea/hub,rlugojr/hub,cpick/hub,tomasv/hub,hopil/hub,hb9kns/hub,xantage/hub,haikyuu/hub,elancom/hub,hb9kns/hub,dongjoon-hyun/hub,pwaller/hub,boris-rea/hub,ASidlinskiy/hub,adjohnson916/hub,rlugojr/hub,pwaller/hub,nlutsenko/hub,adjohnson916/hub,elancom/hub,ryo33/hub,ryo33/hub,ASidlinskiy/hub,nlutsenko/hub,aereal/hub,isundaylee/hub,terry2000/hub,jingweno/hub,jingweno/hub,aereal/hub,pwaller/hub,pcorpet/hub,pankona/hub,naru0504/hub,RichardLitt/hub,whilp/hub,haikyuu/hub,haikyuu/hub,aspiers/hub,adjohnson916/hub,github/hub,isundaylee/hub,SanCoder-Q/hub,aspiers/hub,codydaig/hub