Release 0.5.1

Fixes the following issues:

- #916 - iTip messages get stuck in Wallace
- #919 - Add message on to indicate setup is indeed running
- #922 - New user is not subscribed to all folders
- #923 - Set up the PHP timezone
- #925 - Not all cli options from setup components are listed in --help
- #927 - Default setup should give access to associateddomain=$domain,cn=kolab,cn=config
- #934 - kolabd ends up in endless loop
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