Upgrade to use grafter-2 and RDF4j 3.x

[RickMoynihan]

• Main change is updating to use grafter-2 namespaces and RDF4j 3.x (rather than an ancient sesame). The bulk of this change was made in updates to the grafter-extra dependency.
• Other minor tweaks
  • Make CI run all the tests again (it looks like this was probably broken during the tools-deps changes)
  • Fix issues with lein-tools-deps and travis
  • Update to recent csv2rdf
  • Update to clojure 1.10.1