[util] Moved TryInstances into main rdf module.
[jena] Fix long line in JenaSolutionsWriter.
Merge pull request #179 from pellucidanalytics/topic/parameterized-return-type-io

parameterized return type io -- small fixes
Merge pull request #180 from w3c/topic/parameterized-return-type-io

Topic/parameterized return type io