updated to latest test files
seperated \(and re-added\) custom tests from json-ld.org tests to allow easier updating of json-ld.org tests
moved constants from JSONLDProcessor to JSONLDConsts, moved internal classes from JSONLDProcessor to external classes for better visibility
all expand tests pass
all compact tests passed
all flatten tests passed
all frame tests passed
all toRDF tests passed, however, triple callback functions are temporarily broken
all normalization tests passed
fromRDF seems good as per the javascript version but not all tests pass yet
all fromRDF tests passed
changed JSONLDSerializers to RDFParsers to better represent their purpose. Added helper utils for RDFParsers to use for generating the internal RDF format. renamed existing Serializers to RDFParsers and implemented them as per the new requirements
updated playground to support --base and all processing options
updated JSONLDTripleCallback to more closely match the JSON-LD RDF API's QuadCallback
removed unused code and updated readme
allow [] as @context in frame(). thanks to @stain for the report