Resource APIs for users and groups

Description

Allows computing a user profile URL.

Examples

• Get a relative profile URL:
  @Inject
  private ResourceReferenceSerializer<ResourceReference, ExtendedURL> serializer:
  
  UserReference userReference = ...
  ResourceReference userResourceReference = new UserResourceReference(userReference);
  String profileURL = this.serializer.serialize(userResourceReference);
• Get a full profile URL:
  @Inject
  private ResourceReferenceSerializer<ResourceReference, ExtendedURL> serializer:
  
  @Inject
  @Named("url")
  private URLNormalizer<URL> normalizer;
  
  UserReference userReference = ...
  ResourceReference userResourceReference = new UserResourceReference(userReference);
  URL profileURL = this.normalizer.normalize(this.serializer.serialize(userResourceReference));