Clarification of GenericName <-> ReferenceIdentifier mapping.
Attempt to simplify DescriptorBuilder with an API which handle "name" and "aliases" as just "names", like GML does.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1574221 13f79535-47bb-0310-9956-ffa450edef68