Removed reject_if from accepts_nested_attributes for listing_change's annotations management. Added code to listing_changes_observer to remove the annotation if the fields are blank
Added spec
Renamed source_id to original_id on Annotations, ListingChanges and ListingDistributions, to avoid confusion with the TradeCodes of type Source. Updated related files
Make sure there's an annotation...
Merge branch 'hotfix-0.7.6'