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
Merge pull request #606 from fcrepo4/80959252

Eliminate dead code

Related to: https://www.pivotaltracker.com/story/show/80959252
Remove datastream references from HTML UI controls
Merge pull request #600 from fcrepo4/remove-html-datastream

Remove datastream references from HTML UI controls
Use FedoraResource#getProperty/hasProperty
Push versioned ancestor logic up to FedoraResource