Ftw.meeting

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- Nothing changed yet.

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- Add organizer to calendar export file. [busykoala]

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- Drop Plone 4.2 support. [mathias.leimgruber]

- Use E-Mail address in ics header instead of userid for the INDIVIDUAL property. [mathias.leimgruber]

- Drop Plone 4.1 support. [jone]

- An older ftw.calendar is required because of breaking changes in
https://github.com/4teamwork/ftw.calendar/pull/19 [jone]

- Replace jq with $.
[lknoepfel]

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- Fix Layout for Images in MeetingItems.
[tschanzt]

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- Fix invalid css, removing an unneeded closing curly bracket.
The CSS of 1.6.0 is invalid
[jone]

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- Highlighting attended meetings in `ftw.calendar`.
[lknoepfel]