Add lemmatization option for normalizing loaded documents #189
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According to #75, there used to be a
lemmatizationoption for theload_document()method'snormalizationparameter.This doesn't seem to be the case any longer -
stemmingis applied or word surface forms are used as stems - even though lemmas are extracted during text loading.I'm (re)adding the
lemmatizationoption as it would be very useful to have for e.g. TF-IDF.