Merge pull request #542 from fcrepo4/resource-converter

Implement a Converter<Resource,FedoraResource> to replace the Node converter
Adjust logging for Jersey to use SLF4J

Resolves: https://www.pivotaltracker.com/story/show/80681518
Add Tombstone resource when a resource is deleted, preventing the re-use of URIs until the tombstone is also removed
Merge pull request #548 from fcrepo4/tombstones

Add Tombstone resource when a resource is deleted, preventing the re-use of URIs until the tombstone is also removed

Resolves: https://www.pivotaltracker.com/story/show/80853212