Add a date column to Paste
Summary:
Show modified date on the right of the list view (which I guess
is also the created date, since pastes are immutable?)
Test Plan: Browse through the many volumes of untitled masterworks.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T1600
Differential Revision: https://secure.phabricator.com/D3145