Remove code not in use any more.
Add an abstract data point type.
Add n to get top n.
Add name-id mapping to shorten the keys.
Remove the empty DashboardService.
Up the key repire days from 90 to 180 days.
Fix key expire.
Merge pull request #10 from eric-wu/master

Add n to get top n to the "top" metrics and add a typed abstract data point