query function should convert sesame types into clojure/grafter ones

[RickMoynihan]

Currently types aren't round tripped, and the types we return are sesame ones.

We need to round trip types so that:

• SesameURI's come back java.net.URI's (which can be used with the grafter-url protocols/libraries)
• literals with an appropriate sesame-rdf-type->type function are converted to the appropriate grafter/clojure type
• un-coerced literals come back as a Literal object.

Before we do this work we also need to deprecate the s function and represent Literals explicitly #24; and also interpret strings as string literals #25.

[lisp]

correspondence from #48 is not sufficient. i will open a new ticket to rephrase the combined issues as they appear in the contexts of #48 and #49