adding rule for English negated contractions and new kaflib version

1.8.3

bumped to 1.8.3 after adding rule for don't and new kaflib version

hardParagraph option, modified segmenter exceptions and bugfixing

1.8.2

bugfix in normalizer of quotes to ascii

bugfix in NAF length attribute, plus option to print non-tokenizable chars

1.8.1

bumped to 1.8.1

Major restructuring, improvements and languages added

1.8.0

minor doc update