Bump Jackson version to 2.2.1

Relevant changes:

JACKSON-884 : JsonStringEncoder.quoteAdStringValue fails to encode ctrl chars correctly
Issue #51: JsonLocation had non-serializable field, mark as transient
rename script file and make it automatically run appassembler if it has not been run since the last mvn clean
Change instructions in readme for script use
Merge pull request #52 from ansell/jsonldplayground-script

Cleanup script file
start of moving towards using the RDFDataset class for the internal RDF format
added options for including namespaces in fromRDF and toRDF results
removed some unnecessary equality code, and fixed a small sorting bug