Creator sort field: Moved creator sort field generation to hyhull codebase (from solr copyfield).  This ensures hyhull deals with situations where multiple creators exist.
QueueSet changes: Added a QueueSet parent due to failing parent validation (QueueSet inherits behaviour from StructuralSet). Updated QueueSet fixtures to reference
hull:rootQueueSet in rels-ext. Added exclusion for parent validation for hull:rootQueueSet object.
XSLT processing: Added Saxon webapp to the project to enable XSLT processing to occur in development/test builds - rake task added. Fixtures re-organised.