Normalizes predecessor data too
Deletes invalid work package custom values
Fixes delete statement for MySQL
Fixes spec
Merge pull request #642 from opf/fix/delete_invalid_work_package_custom_values

[FIX] Delete invalid work package custom values
updated changelog
Fixed LegacyJournalMigrator to also run with Ruby 2.0 with added syck
redirect old issue links to wp uris
fixed redirect old issues to ne wp
added comment for redirect issue 2 wp
added changelog entry for issue 2 wp redirect
Merge pull request #647 from opf/feature/redirect_old_issue_links_to_work_packages

redirect old issue links to wp uris