Refactor watcher validation of a user's permission to watch
Move part of the filtering in watchable#watcher_recipients on SQL-side
Add delayed job's rails 3 upgrate migration
Send work package update notifications asynchronously
Rewrite double negation
Rewrite another double negation
Deactivate delayed job in unit tests
Update changelog (#2448)
Fix specification when ensuring watcher email notifications
Fix another error in watcher notification on watchable update spec
Merge remote-tracking branch 'origin/feature/rails3' into bug/watcher_performance

Conflicts:
	doc/CHANGELOG.md
Merge pull request #511 from opf/bug/watcher_performance