R1:583cca0d7c58

Various statistics about revisions at /differential/stats/revisions/

Summary:
Show some statistics, like number of revisions, number of
revisions per week, lines per revision, etc. for phrivolous amusement.

Test Plan:
- Went to /differential/stats/revisions/
Numbers seem right
- Clicked 'Accepted'
Again
- Changed to another user with long history
Load time was not too long though delay noticeable
- Clicked 'Requested changes to'
User was preserved, looks good

Reviewers: epriestley, btrahan

Reviewed…