reviewers as metadata
Summary:
The "Add reviewer" implementation is super lazy right now since I didn't want to
do a schema change. Man up and add a column. I also plan to store "via"
information here (e.g., via email or via mobile).
NOTE: This schema change may take a while since the comment table is pretty big
in Facebook's install.
This needs a little CSS work but I think it's reasonable for now.
Test Plan:
Made comments on revisions and tasks. Added reviewers to a revision, got linked
names instead of a blob of text.
Reviewed By: aran
Reviewers: tomo, jungejason, tuomaspelkonen, aran
Commenters: tomo
CC: aran, tomo, epriestley
Differential Revision: 394
