R1:9f35a3ba45a2

Highlight away and sporadic users in revision list

Summary:
This is not so general as `getRequiredHandlePHIDs()`.
It allows bulk loading of user statuses only in revision list.

It also loads data in `render()`. I'm not sure if it's OK.

Maybe we can use the colorful point here.
Or maybe some unicode symbol?

Test Plan: {F11451, size=full}

Reviewers: btrahan, epriestley

Reviewed By: btrahan

CC: aran, Koolvin

Differential Revision: https://secure.phabricator.com/D2484