Fix JavaScript exception when having users with special names

Summary:
The issue was noticed in Firefox when user with login "watch"
was registered in the database. And it was caused by Object
in Firefox having "watch" method.

Solved by checking for whether lookup object does have own
property before using it as a map key.

Test Plan:
To test the issue simply create a user with login "watch",
open the phabricator site in Firefox and try to assign any
maniphest task to this user. You'll see exception being
printed to the javascript console (in my case it's printed
to firebug console).

Reviewers: #blessed_reviewers, epriestley

Reviewed By: epriestley

CC: epriestley, aran

Differential Revision: https://secure.phabricator.com/D8037
Allow arc project and branch showing up in diff emails

Summary: Add the arc project and branch fields in emails for revisions under review. I am not quite sure why we only show them for changes which is already accepted or needs revision. It would be nice to have them for changes under review too.

Test Plan: Create a new revision and check email

Reviewers: epriestley, lifeihuang, JoelB, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8035
Use callsigns, cards on repository lists

Summary: Minor, adds the Callsign and changes to cards view when listing repositories.

Test Plan: Reload sandbox list of repositories, see new items.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8036
Fix feed widths

Summary: Use standard 16px

Test Plan: reload feed, now aligns with search

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8038
Add dates to notifications page

Summary: Fixes T3957, adds timestamps to the notifications page.

Test Plan: View my notifications page, see the new time stamps. Uncertain if I set $user correctly.

Reviewers: epriestley, btrahan

Reviewed By: btrahan

CC: Korvin, epriestley, aran

Maniphest Tasks: T3957

Differential Revision: https://secure.phabricator.com/D8039