Bug fixing for cluster!
- nltk renamed some of its packages, leading to LookupErrors when running knowledge (#53, reported by Clara Marcille, Mikołaj Bojańczyk and Pierre Lafourcade)
- cluster now treats newlines '\' as spaces (#60)
- scopes in cluster are now case-insensitive (#61)
- typo fix (#57)
Full Changelog: v0.7.3...v0.7.4