Textnet.plot and TextnetBase.plot now accept arguments to selectively suppress node or edge labels. node_label_filter and edge_label_filter optionally take a function that is mapped to the iterator of nodes and edges. Only nodes or edges for which the function returns True are displayed in the plot. For example, node_label_filter=lambda n: n.degree() > 2 ensures that only nodes with a degree greater than 2 are displayed. Noun phrases created by Corpus.noun_phrases() can now be normalized (lemmatized) by passing normalize=True (defaults to False). Corpus now has a useful string representation. Documentation updates, particularly to show the label filter functionality.