Removing unnecssary authorization call since we pull the user id from the authorization header
 - Removing database field conferences.contact_user_id, and removing that field from all other objects through the project
removing unused import
Adding sql for registration_views, entity class `RegistrationViewEntity` and service class `RegistrationViewService`
Adding functional tests for `RegistrationViewResourceFunctionalTest`s
Merge branch 'feat/stored-views' of http://github.com/CruGlobal/conf-registration-api into feat/stored-views

Conflicts:
	src/main/db/files/registration_views.sql
	src/main/java/org/cru/crs/api/RegistrationViewResource.java
	src/main/java/org/cru/crs/api/model/RegistrationView.java