Restrict Tagregator to specific date range

[iandunn]

Usually WordCamps only want ​Tagregator to run leading up to the event, and for a few days or weeks after it. Otherwise, you end up with a bunch of unrelated hashtags cluttering the page (​example).

We should add an option to let organizers specify a date range, and it should only pull in new posts during that range.

[coreymckrill]

1405-tggr.diff​ adds optional filters in the Tagregator plugin that can be used to set a start date and an end date for importing new items.

This could be expanded later with option fields in the Tagregator settings UI.

1405-wcorg.diff​ adds a WordCamp.org-specific mu-plugin function that sets an end date for a particular WordCamp site to two weeks after the camp has occurred.

[coreymckrill]

Patch for Tagregator plugin

[coreymckrill]

Patch for WordCamp.org

[coreymckrill]

Updated the patches to remove the unnecessary $blog_id filter parameter.

[iandunn]

LGTM.

Committed 1405-tggr.diff​ in [plugins1836693].

1405-wcorg.diff​ still needs to be tested and committed. Feel free to do that whenever you have time.

[coreymckrill]

In 8307:

WordCamp: Stop importing Tagregator items 2 weeks after a camp has occurred

Fixes #1405
Props coreymckrill