Remove all code related to participating an event as an anonymous user

The code is currently unused. There are some notes about re-integrating
this feature, but I think in this case we should rebuild it. The code is
pretty unwieldy.
Temporary hotfix for shellycloud-forwarded hostname (refs #477)
Move OmniAuth host to production.rb
Typo Kalendar -> Kalender
typo
Merge pull request #496 from muescha/patch-3

typo: dieses ->  diese -> dieser
Merge pull request #492 from muescha/patch-1

Typo Kalendar -> Kalender
Merge pull request #463 from hacken-in/remove-attending-as-anonymous-user

Remove all code related to participating an event as an anonymous user
in wich i fix more random things

* add more attributes to user params permit in admin
* shelly cloud hint color in mobile sidebar
* team page on mobile now is not too small to read
added password email address, fixes #497
fixed layout of user edit, fixes #491
add tooltip to category color indicator, fixes #481
add tooltip to new suggestion path, fixes #480
Merge pull request #502 from hacken-in/480-add-tooltip-for-new-suggestion

add tooltip to new suggestion path, fixes #480
Merge pull request #501 from hacken-in/481-add-title-to-color-indicator

add tooltip to category color indicator, fixes #481
Merge pull request #500 from hacken-in/491-user-edit

fixed layout of user edit, fixes #491
Merge pull request #498 from hacken-in/more-mobile

in wich i fix more random things
Merge pull request #499 from hacken-in/497-password-email-address

added password email address, fixes #497
Tiny bootstrap helper to get new users started with hacken.in #394

This (not so tiny) change will move everything Vagrant-related to a
separate folder /vagrant and bootstrap a smaller Gemset from there, so
users without PostgresSQL header files can also give hacken.in a try. :D
Merge pull request #464 from hacken-in/394-bootstrap-script

Tiny bootstrap helper to get new users started with hacken.in #394