Added

• Support for element traversal via the Visitor pattern (#14)
  • DefaultSirenElementVisitor for visitors that don't need to visit every type of element
  • LinkFinder for searching an entity's links
  • ActionFiller for populating an action's fields
  • CompositeVisitor for composing multiple visitors
• Support for crawling an API via crawl (#15)
• Support for validating fields on action submission (#16)
• Default JSON serializer (#27)
• Advanced submit usage examples in the JSDocs
• Default serializer is available for extension (see submit docs)

Changed

• Links to source in the docs are no longer generated