Brian S. Stephan e8e42cc580 twitter: replace since_id with mentions_since_id
we'll want to treat the since_ids for mentions and (theoretical)
timelines differently, i think, so might as well just set up the split
out field now
2016-01-24 18:46:06 -06:00
..
2015-06-16 20:27:44 -05:00
2016-01-16 18:02:17 -06:00