Ftw.participation

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- Nothing changed yet.

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- Add reminder button for pending invitations. [2e12]
- Use unittest instead of unittest2. [busykoala]

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- Fix AttributeError "get_target" when accepting. [jone]

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- Fixes an issue where it was not possible to invite an existing user whose userid
was not equal to his loginname. [elioschmutz]

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- Prevent crash when changing roles of participants if
"Products.PloneHotfix20160830" is installed. [mbaechtold]

- Prevent crash if "ftw.activity" 1.x is installed. [mbaechtold]

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- Improve ftw.lawgiver support for translated role titles. [jone]