Textblob

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Bug fixes:

- Fix bug that raised a ``RuntimeError`` when executing methods that
delegate to ``pattern.en`` (:issue:`230`). Thanks :user:`vvaezian`
for the report and thanks :user:`danong` for the fix.
- Fix methods of ``WordList`` that modified the list in-place by
removing the internal `_collection` variable (:pr:`235`). Thanks
:user:`jammmo` for the PR.

-------------------

Bug fixes:

- Convert POS tags from treebank to wordnet when calling ``lemmatize``
to prevent ``MissingCorpusError`` (:issue:`160`). Thanks
:user:`jschnurr`.

-------------------

Features:

- Add `TextBlob.sentiment_assessments` property which exposes pattern's
sentiment assessments (:issue:`170`). Thanks :user:`jeffakolb`.

-------------------

Features:

- Use specified tokenizer when tagging (:issue:`167`). Thanks
:user:`jschnurr` for the PR.

-------------------

Bug fixes:

- Avoid AttributeError when using pattern's sentiment analyzer
(:issue:`178`). Thanks :user:`tylerjharden` for the catch and patch.
- Correctly pass ``format`` argument to ``NLTKClassifier.accuracy``
(:issue:`177`). Thanks :user:`pavelmalai` for the catch and patch.

-------------------

Features:

- Performance improvements to `NaiveBayesClassifier` (:issue:`63`, :issue:`77`,
:issue:`123`). Thanks :user:`jcalbert` for the PR.