Merged clarkparsia/stardog-clj with quoll/stardog-clj commit https://github.com/quoll/stardog-clj/commit/cfc5f98e97457cc4bf7c0d56eba00751bcdeb66b

Added Clojure->RDF conversion to match the RDF->Clojure conversion in stardog/values
Added adder wrapper
Standardized on a database specification using a clojure map, combining approaches to connection handling
Added initial midje test cases for some core capability, creating a data source, creating a connection, running a query, running an insert

Updated README