Respect sticky date in message order
Save sticky date if sticky is set
Respect sticky in default order
Add new colum sticked_on

Using data from this column will help us to put sticky messages on top of messages list
Add cuke
Reset sticky date when sticky option is reset
Fix sticky date set
Add specs
Merge branch 'bugfix/284_sticky_does_not_apply_to_forum' into dev
Adds changelog entry