docs: function prepareProfileDir(profilesDir, nick) {
    var nick = nick || '.tmp';
    // Just in case `nick` has any funny business...
    nick = nick.replace(/[^\w\d.]/g, '-').replace('..', '-');
    var profileDir = path.join(profilesDir, util.format('vox-%s', nick));
    debug('Ensuring directory at %s', profileDir);
    mkdirp.sync(profileDir, 0700);
    return profileDir;
  }