Notes.
First pass on redis-backed tokenizer.
Blocking in utility methods.
Fixes Redis-backed terms getter.
Breaks away separate Redis key getters.
Convert term_counts and unstem to work with Redis providers.
Migrating methods to Redis providers.
Check to make sure that keys exist before trying to delete them.
Abstracts tokenization out of the Text class.
Ready for KDE querying.
Hardens the kde() method to gracefully handle terms that aren't present in the text.
Formatting tweaks.
Breaks apart separate setter methods.
Memoize all the methods
Strips out Redis stuff.