additional checks
Merge branch 'development' of https://github.com/aracrown/league-manager into development

Conflicts:
	sports-core-api/src/main/java/org/aracrown/core/rest/AbstractWriteResourceService.java
	sports-core-api/src/main/java/org/aracrown/core/util/ConstraintViolationBuilder.java
	sports-rest-admin-impl/src/main/java/org/aracrown/sports/rest/admin/impl/LeagueSeasonWriteServiceImpl.java
	sports-rest-admin-impl/src/main/java/org/aracrown/sports/rest/admin/impl/TournamentWriteServiceImpl.java
- Resteasy version update to 2.3.7;
- Validation errors now with error code;