Swift Mailer TODO List
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  * Add VERP functionality, probably via plugin
  * Possibly make ConnectionRotator/Multi deal with failied connections during the
    send process - again, for batch mailing. Currently these connections only check
    for failures at connection time.
  * Refactor code in Swift_Message_Headers and Swift_Message_Encoder
    - There is some post-processing of strings done in the headers class which could
      be handled in the encoder.
  * Create a plugin for embedding remote and local files automagically

Cutting down on classes:
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  * Merge Swift_Connection and Swift_ConnectionBase
  * Move Swift_Mime_Boundary logic to Swift_Message_Mime::generateBoundary();
  * Scrap AddressContainer class - wtf?
  * Move Swift_FileNameMaker logic into Swift_Message_Mime... maybe.