Paste - add created time to pastes in a list
Summary: Fixes T5943. We do this differently in different places; Audit / Differential do something like this while Pholio expands the "byLine" to include a timestamp. Go with the Audit / Differential approach, as presumably having the date as a top line, easily scannable metadata is the goal here.
Test Plan: viewed a list of pastes and saw a timestamp of creation at the top.
Reviewers: epriestley, chad
Reviewed By: chad
Subscribers: epriestley, Korvin
Maniphest Tasks: T5943
Differential Revision: https://secure.phabricator.com/D10338