v9.0.0

benchmarked between 30-50% faster on parsing+tagging

• renames Term.tag object to Term.tags so the .tag() method can work throughout more-consistently
• fixes 'Auxillary' tag typo to 'Auxiliary'
• optimisation of .match(), and tagset - significant speedup!
• adds .tagger() method and cleanup extra params
• adds wordStart and wordEnd offsets to .out('offset') for whitespace+punctuation
• new .has() method for faster lookups