Use methods on FedoraResource instead of getting the JCR Node
Merge pull request #604 from fcrepo4/no-jcr-node

Use methods on FedoraResource instead of getting the JCR Node
Insert the 'check fixity' link in the HTML serialization by using the hasFixityService predicate
Merge pull request #605 from fcrepo4/check-fixity

Insert the 'check fixity' link in the HTML serialization by using the ha...
refactor getClusterExecutor into Function subclass
push rarely-used repositoryService injection down inheritance tree
refactor Service into a genric interface

simplify node existence checks in AbstractService and delete commented-out code
Checkstyle updates
ignore checkstyle dot files

style conformance in UUIDPidMinter
remove unused RDF type constants and regularize produced serializations