EZP-21733: implemented LimitationValidationException
EZP-21733: added LimitationValidationException to methods requiring it
EZP-21733: implement usage of LimitationValidationExcetpion
EZP-21733: unit tests for throwing LimitationValidationException in RoleService
EZP-21733: integration tests for throwing LimitationValidationException in RoleService
Fixed: typos
Fixed: create policy resource and method
Fixed: malformed XML
EZP-21733: document InvalidArgumentException on selected methods
EZP-21733: handle new exceptions in Role controller
EZP-21733: documented new error responses
EZP-21733: added BC note
Merge pull request #567 from ezsystems/fix-EZP-21733-role-service-exceptions

Fix EZP-21733: Improve exceptions thrown in RoleService