IdStory Identity Manager

I've updated whole architecture page (dtos, links, spring data rest removal ...) and added note about lookup service:
https://wiki.czechidm.com/devel/dev/architecture/backend#spring_data_rest
https://wiki.czechidm.com/tutorial/dev/lookup_service

Tests are added:
https://github.com/bcvsolutions/CzechIdMng/blob/develop/Realization/backend/core/core-impl/src/test/java/eu/bcvsolutions/idm/core/model/service/impl/DefaultLookupServiceIntegrationTest.java

Could you pls do a review?

I did review, i already used lookupService for some issues, works perfectly! And tutorial are awesome :) thanks for implement codeable.