code: func NewCatAliasInfo(aliasLine string) (catAlias *CatAliasInfo, err error) {
  	split := strings.Fields(aliasLine)
  	if len(split) < 2 {
  		return nil, ErrInvalidAliasLine
  	}
  	catAlias = &CatAliasInfo{}
  	catAlias.Name = split[0]
  	catAlias.Index = split[1]
  	return catAlias, nil
  }
docs: //Create an AliasInfo from the string _cat/alias would produce
  //EX: alias alias
  //i   production production_20160405075824