0.11.7

Fixes just one issue:

• #120 BREAKING CHANGE Explicitly support xsd:date and xsd:dateTime. NOTE the resolution here is a breaking change for those who previously used a java.util.Date to serialise as an xsd:dateTime. Now xsd:dateTime's are represented by java.sql.Time objects and xsd:date's are java.util.Date objects. This should primarily effect pipeline writers. e.g. setting a triple like [some-uri dcterms:modified (java.util.Date.)] previously would serialise an xsd:dateTime, now serialises as just an xsd:date. Changing the above to be a java.sql.Time object will restore previous behaviour.