Import seeds and Gemfile from feature/rails3.

git checkout opf/feature/rails3 -- db/seeds.rb db/seeds Gemfile
Merge remote-tracking branch 'opf/feature/rails3' into feature/journal-migrations
Merge branch 'bug/message_journals_table_requires_updated_on' into feature/journal-migrations
Adds seeds from feature/rails3.
Adds migration for legacy journals.

Legacy journals need to be transformed to current journals. This
amazing new migration does it.
Check migration prerequisites.
Adds journal creation to migration.
Extend legacy journal migration

The legacy journal migration now includes normalization into the data
tables. This involves combining previous journals (diffs) into the new
normalized schema and extends to changesets, news, messages and work
packages.
Introduces new migration dated after previous fixes.
Remvoes obsolete migration.