R1:11ffed7cfc9d

Fix paging for 'before ID' queries

Test Plan: https://secure.phabricator.com/paste/filter/all/?before=157 - 158 is missing.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Koolvin

Differential Revision: https://secure.phabricator.com/D2330