Postbox 2.1.3

- Performance and Stability Improvements
- Added ability to add address book cards without e-mail address to the Postbox Address Book
- Fixed an issue with fetching RSS articles
- Fixed an issue with summarize mode for French users
- Fixed an issue with saving drafts of messages that contained signatures with images
- Improved order of Quick Move and Quick Switch results
- Improved migration and import from Mail.app
- Now compatible with the Mac App Store version of OmniFocus