Add archived_at to PrioritizedIssues.
UI for archiving all closed issues in the user's current buckets.
- Scope for PrioritizedIssues for a particular bucket now only returns active issues.
Move hardcoded archive path outta CS and into the view.
Merge branch 'master' into archived-at
Merge pull request #13 from juliamae/archived-at

Add archiving of closed issues