Fix to close database connections properly, whilst also allowing fine
grained control over connections.
Fix test so it doesn't require a fixture which can be brittle when run
at the REPL.
Add debug log output and clojure.tools.logging dependency.
Improved docstring and recommendations on controling
resource usage with query.
Switch *warn-on-reflection* off, way too noisy by default.
Merge branch 'master' of github.com:Swirrl/grafter

Removed type hints from tests, as they're unnecessary.

Conflicts:
	test/grafter/rdf/sesame_test.clj