Add getIds as a SOAP service and REST HTTP GET
- Add an idsType to the content schema
- Add SOAP related XML to the content-service schema and WSDL
- Add a getIds operation to the ContentDao
- Implement the getIds operation in the iBATIS ContentDaoImpl
- Add a getIds method to the ContentSerivce and ContentServer
- Implement the getIds method in ContentServerImpl, ContentServiceImpl,
  and UnwrappedContentServiceImpl
Add an add service that uses a server-side generated UUID
- Use UUID.randomUUID() to generate a UUID in ContentServerImpl
- Assign POST / as the HTTP operation in ContentServer
Improve error handling in ContentServerImpl
- Use Response.Status instead of int for
  WebApplicationException
- throw BAD_REQUEST if the UUID.fromString() throws
  IllegalArgumentException