- Add A LOT of migrations to finally decide and set the database relations
for subdomain preferences \n
- Add the base, which is needed so that every subdomain have a different
  preferences (configs) \n
	- This includes SubdomainPreference model, which belongs to tenant
	  (one tenant have many preferences) \n
	- (Looking) Fine config for apartment and model exclusions \n
	- Implement automatic add of the default subdomain preferences to
	  every tenant, when the tenant is created. (to add/modify config go
to Tenant#set_default_preferences) \n
Merge branch 'different_index_for_every_subdomain_api'

Conflicts:
	app/controllers/application_controller.rb
	app/models/tenant.rb