validate numeric and date options in timelines.
changelog.
also except nil values for date&numeric. (=empty)
There is no 31st of february.
Adapts header type to work package
Adds spec
Passes the change author to the delayed job

This fixes the not working 'RemoveSelfNotificationsInterceptor'
Improves spec
Use permitted params instead of safe attributes in work packages bulk controller...


... to allow for cost_object_id updates (fixes #2591)
Fix work_packages/bulk#update if no work package params are passed
Perform individual parameter whitelisting during work package bulk update
Update changelog (add #2718)
Migrated serialized yaml in core tables from syck to psych
Added changelog entry
Merge pull request #645 from opf/bugfix/2591-cost-objects-in-context-menu

Bugfix/2591 cost objects in context menu
Fixed Bug 3046

- Edit-form for work package updates does not respect user preference for journal ordering
added changelog entry for 3046
Added changelog entry
Merge pull request #667 from opf/fix/emails_sent_for_own_changes

[FIX] emails sent for own changes
Also fixed wrong permission check for update form