JSON-LD for Sesame.

I've added basic JSON-LD support for Sesame implementation with https://github.com/jsonld-java/jsonld-java/tree/master/integration/sesame

Open question for me is how to support multiple JSON-LD profiles - http://json-ld.org/spec/latest/json-ld/#application-ld-json. As quickfix I hardcoded compacted profile, but it is only temporary solution. Any advice would be appreciated.

There is similar integration for Jena https://github.com/jsonld-java/jsonld-java/tree/master/integration/jena, but I haven't added it to banana yet.