Upgrade dependency of Jackson to 2.7.0

We use the JSON library Jackson 2.3.3, but the latest version is 2.7.0

Upgrading Jackson should check their changelog for API changes, as Jackson is part of
SCUFL2 APIs Configurable - and also in Taverna Engine's ExecutionEnvironment

Can we assume Semantic Versioning ? If so we should be fine.

Also I believe the json-ld library used by Jena for read/write of JSON-LD depends on Jackson.

Generally I think the unit tests should uncover any issues, but it's worth also checking the command line launcher after upgrading to see it also works fine within OSGi.