Deactivate inactive pledges

[iandunn]

#211 started sending emails to companies regularly, asking them to update their pledges. If they don't have any confirmed contributors, it mentions that they'll be deactivated. The 5ftf_inactive_deactivate_date meta field was added to indicate when they can be deactivated.

In this issue, we should:

• [ ] add a cron job to remove contributor posts that have 0 hours, so that the count of confirmed contributors on pledges will be accurate. That could maybe tie into update_all_cached_pledge_data.
• [ ] add a cron job to pull all companies that have 5ftf_inactive_deactivate_date < now(). If they still don't have any confirmed contributors, we should deactivate them. If they have added contributors, then we can delete the 5ftf_inactive_deactivate_date field.
• [ ] send companies a final email notice that their pledge is deactivated, with a note on how to reactivate their pledge
• [ ] send contributors a final email, similar to above. avoid sending send_contributor_removed_email()

[angelasjin]

@iandunn As part of this, can contributors and companies get a final email notice that their pledge is deactivated, with a note on how to reactivate their pledge?

[iandunn]

No problem, I've updated the checklist with those.