fetch_teams

to be more specific than fetch_members. Example is actually our `con` organization: we have teams for internationalization etc, overall too many members and too non-specific to include all. But if we specify some team(s), I think it would be fine.

Instead of adding another option, I guess could be made into `fetch_members` would take any list as a list of teams... but becomes too cryptic -- `bool/regex/[teams]`

edit: might want to allow `teams:` object with "include" or "exclude" regexes , having which would reply in general `true` to fetch members but then filter out one way or another based on teams.