Make open-tabular-file :csv ignore :ext options passed to dispatcher
Make open-all-datasets tests robust to file ordering
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
Fix open-tabular-file etc... to parse CSV keyword arguments properly.
Merge pull request #8 from Swirrl/open-txt-file

Open txt file
Fix statements to be 4.5x faster at parsing RDF files with statements*.

* Tested on a file of ntriples.  Works by batching the queue between
  threads at a default of 32 elements at once.

Also made statements batch size configurable (when parsing RDF) with the
:buffer-size option.
Better comment on buffer-size option.
Removed junk code.
Propagate nil when converting string to RDF type.
Much faster code paths to add raw InputStreams/Readers to
ITripleWriteables.

These code paths allow users to go direct instead of using statements
when eagerly reading raw RDF.
Upgrade to latest sesame, v2.7.14.
Fix: For genuinely lazy derive-column and add-columns functions.
Remove println
Add Vocabulary (prefixers) for ONS/ Statistical Geography
Vocabs - oops forgot theme