stable version: 3.0.0-beta.4

Conflicts:
	config/deploy/stable_version.rb
[FIX CI] add.feature
[FIX CI] edit_contract_line.feature
[FIX CI] hinweis_wenn_nicht_angemeldet_feature
[FIX CI] inventarhelfer.feature
Merge branch 'next'

* next: (36 commits)
  Fix CI: features/examples/model_eigenschaften.feature
  [FIX CI] modell.feature
  [FIX CI] modellliste.feature:131
  [FIX CI] modellliste.feature:28
  reset to Capybara.default_wait_time = 2
  Fix CI: features/examples/werteliste.feature:15
  [FIX CI] borrow/vorlagen.feature:42
  [FIX CI] sign_contract.feature:41
  [FIX CI #1186]
  [FIX CI] kalender.feature
  [FIX CI #1184]
  [#53874439] Update Capybara to 2.1.0 (first step)
  Include Rake in the Gemfile so that cronjobs work.
  Use the latest leihs Vagrant box.
  stable version: 3.0.0-beta.4
  Test edit item validation: item not in stock, item in contracts
  Inventory helper tests: retire item validation & correction of other tests
  Explorative Suche.Explorative Suche in der Aushaendigung
  Test: Inventory helper retire item which is not in stock WIP
  [HOT FIX] hand over stack level problem
  ...

Conflicts:
	features/step_definitions/backend/hand_over/add_steps.rb
	features/step_definitions/backend/hand_over/edit_contract_steps.rb
	features/step_definitions/examples/hinweis_wenn_nicht_angemeldet_steps.rb
	features/step_definitions/examples/inventarhelfer_steps.rb
updating version
Support LDAP config setting.
Read LDAP_CONFIG from the correct object.
Porting fixes from next.
Porting fixes from next.
Adding missing file from LDAP fix.
[Fix] If there is no title, navigation is overlaid by the form
[HOTFIX] Models that are only rentable for specific groups can now be rented
Fixing spec.
upgrading version to 3.0.0-rc.1.4
Merge branch 'master' into next

Conflicts:
	features/step_definitions/borrow/kalendar_steps.rb
	spec/controllers/hslu_ldap_controller_spec.rb