Revert "don't render absolute attachment links, it's not necessary and breaks on tests"

This reverts commit cdcc3102d22dfd9af49af748ed8242bb69cd3b2f.
fix escaped html for required custom_fields in issue forms. fixes opf #529
Merge pull request #130 from opf/feature/rails3_fix_escaped_html_for_custom_fields

fix escaped html for required custom_fields in issue forms
fixed failing spec

- since eb5ef61b8a67b all attachment links in the journal_formatter are
  absolute
Remove db plugin migration code

We now use rake <plugin>:install:migrations.
Merge pull request #131 from opf/feature/rails3_remove_plugin_migrate_tasks

Remove db plugin migration code