Initial version of db-populator and db-seeder.
Updater is added.
  - FFDB class is created.
  - Updater script is created.
Various updates.

- Feed sources to fetch are now kept in DB.
- Entry sources are also kept in DB.
- Now, updater can work online and offline. Old scripts are not needed
  anymore.
- Code clean-up.
- BUGFIX: Files are now added to DB.
Ignoring swap files.
File downloader script is added.