improwiki updates

State of play: 516 groups and more than 100 events in Improwiki. Thank you for your participation!

Groups now have a nicer page.
- There you can upload a logo and a background image.
- User can connect to groups and say 'I am a member this group '
- The groups then appear on the User Profile
- Users can publish posts on their own page
- The biggest innovation: There are now events.
- Events can be assigned to groups and players
- The events of a user appear in his profile
- The events of a group appear in the Group Profile
- You can now, if you would like to the user name, in addition to the still Real Name specify.