R1:0609133f4564

Limit notifications to latest 10, instead of 15

Summary: This panel just gets super tall at 15 now that date is on it's own line.

Test Plan: Reload panel, count to 10.

Reviewers: epriestley

Reviewed By: epriestley

Spies: Korvin

Differential Revision: https://secure.phabricator.com/D18486