Remove jsonld module which is deprecated by jsonld-java-sesame

https://github.com/jsonld-java/jsonld-java/tree/master/integration/sesame
remove jsonld reference in pom.xml
fix rdfjson imports
check language before datatype to work with rdf-1.1

add more tests to verify behaviour for datatype and language literals

some of the tests should start to fail from sesame-2.8 as plain literals become xsd:string
Complete testCompareLiteralObjectsTyped
add static instances for StatementComparator and ValueComparator

also use Literal.getLabel instead of stringValue
work on testCompareLiteralObjectsTypedAndLanguage
complete testCompareLiteralObjectsTypedAndLanguage
Merge pull request #35 from ansell/feature/remove-jsonld

Remove jsonld module which is deprecated by jsonld-java-sesame
Cleanup, Sesame version bump before merge
Merge pull request #36 from ansell/feature/rdf-1.1-comparators

Make comparators compatible with RDF-1.1
Resolved merge conflict
Merge branch 'develop' of github.com:joshsh/sesametools into develop
Updated Sesamize writer/parser dependencies
Simplified Sesamize command line args, added global SesameTools properties including current version
Cleanup and JavaDoc for the common utilities
Additional JavaDocs
Updated the README
License tweak
Final changes for 1.8