Fix for #54
Fix for #54

Just take trailing / from first arg, which should always (afaict) be the
right thing to do.

ingydotnet/git-subrepo,brijendratiwari/git-subrepo,ingydotnet/git-subrepo,stsquared99/git-subrepo,perlpunk/git-subrepo,dzzh/git-subrepo,stsquared99/git-subrepo,dzzh/git-subrepo,brijendratiwari/git-subrepo,perlpunk/git-subrepo