Ftw.notification.email

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- Nothing changed yet.

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- Add content ID support [Nachtalb]

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- Add optional support for ftw.activity. [jone]

- Fire new INotificationEmailSentEvent when sending emails. [jone]

- Drop support for Plone 4.1 and 4.2. [jone]

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- Fix email template.
The sender was listet twice in the email footer
[elioschmutz]

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- Fix bug when building emails with an actor / reply-to header.
This sems to be a regression from the refactoring in 2.0.8.
[jone]

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- Refactor email composing to use Header objects instead of strings.
[tschanzt]

- Update French and English translations.
[jone]