Add styles to tables in details-pane

- added styles to tables in details-pane
only display links to users' comments if they are active.
Select watcher with select2
Move user active method into helper as it will be needed elsewhere.
Fix the red-border in required field

- fixed the red-border in required field
Merge pull request #1723 from opf/fix/red-border-comments-box

Fix the red-border in required field
Startup Times: Output to STDERR

This allows discarding the benchmark output by only reading
from STDOUT, e.g. for using `rake secret` in a script.
Refactor flash message methods
Inform user about watcher addition/removal state
Remove watcher without receiving the whole WP again
Merge branch 'dev' into feature/styleguide-details-pane-table
Merge pull request #1720 from opf/fix/no-links-to-inactive-users
use detail-pane-table style for relations table
Development seeds: Make number of users configurable

Also, reduce default to 3 users instead of 30. I'm not into waiting 5 minutes
after setting up a new development database.

Set a SEED_USER_COUNT env var if you want more users.
Merge pull request #1724 from opf/feature/startup_bench_to_stderr

Startup Times: Output to STDERR
Use generalised table styles for relations and attachments.
Merge pull request #1726 from opf/feature/14011_add_drop_down_or_search_field_to_add_watchers

[Feature] 14011 add drop down or search field to add watchers
add titles for attachments and relations table headers.
Merge pull request #1717 from opf/feature/styleguide-details-pane-table
Merge pull request #1727 from opf/feature/faster_development_seeds

Development seeds: Make number of users configurable