adding Setting.app_name to customize the application name in your_platform.

trello: https://trello.com/c/KUdRePRv/683-yourplatform-setup
moving things to your_platform.

* jquery-datatables-rails gem
* officers_helper
* xls mimetype
* sidekiq gem
introducing jquery.turbolinks

This binds the jquery ready events to work with turbolinks.

https://github.com/kossnocorp/jquery.turbolinks
fixing some styles on the bootstrap layout.
list export: implementing first statistics of group joinings.

trello: https://trello.com/c/3n5jjCF6/705-statistik-fur-die-wingolfsblatter
beginning to implement statistics page.

trello: https://trello.com/c/3n5jjCF6/705-statistik-fur-die-wingolfsblatter
fixing typo in list export class.
ability: local admins cannot change the tokens, only the internal tokens.