Add integration test for SPARQL query over previously undefined properties

Resolves: https://www.pivotaltracker.com/story/show/61446628
Adding topic() to the context for RdfStream

Resolves: https://www.pivotaltracker.com/story/show/61500248
Added namespace-related triple production to JAX-RS producers
Merge pull request #169 from futures/custom-properties

Add integration test for SPARQL query over previously undefined properties
Supressed links to modify nodes on the frozen node HTML view.
Updated checksum exception message.

Resolves: https://www.pivotaltracker.com/story/show/61007988
Merge pull request #172 from futures/NamespacesForStreamedRDF

Added namespace-related triple production to JAX-RS producers
Implemented auto versioning policy, made explicit versioning the default.