updated README (part of docs update)
improved error handling: options for ignoring errors and handlers for NTriplesParser and RdfXmlParser
updated RDFa test suite
prepare release v0.4
[maven-release-plugin] prepare release v0.4
[maven-release-plugin] prepare for next development iteration
updated RELEASE_NOTES for 0.4 release
SesameRDFaParser: added constructor which allows to specify custom XMLReader
RDFa testsuite update
fixed issue #13
updated RDFa testsuite test case 278