Fix comment typo
Add Fisher's exact test
do multi-word windows in the style of Church and Hanks (1990)
oops
Possible fix for the lowest_common_hypernyms

Currently lowest common hypernyms do not return a result based on the
hypernym paths of the 2 synsets. So there may be a "better" result when
taking into account the hypernym paths.
Address some of jnothman's comments
Fix comment
Fix detect_encoding regex in corpus.reader.xmldocs.XMLCorpusView
Speed improvement on GAAClusterer

New improved vectorized version of GAAClusterer that is orders of magnitude
faster than the previous one.
Updates to GAAClusterer so that the new cluster_vectorspace function
conforms to PEP 8.
Readability changes and comment additions to GAAClusterer

- Removed _average_similarity and imported cosine_distance
- Added _average_link to be clear about how the distance
  matrix is updated after merge
- Changed sim to dist since we are using distances instead
  of similarities now
Renaming _average_link to _merge_similarities
[nltk/tokenize/punkt.py] typo: taret -> target
Consolidate changes into single function

Based on suggestions from Tschier to use max_depth() function
Merge pull request #420 from Siddhant/patch-1

[nltk/tokenize/punkt.py] fix typo: taret -> target
Updated the docstring
In lch_similarity, added checking of depth to avoid ZeroDivisionError
Merge pull request #417 from wroberts/xmlcorpusview_detect_encoding

Fix detect_encoding regex in corpus.reader.xmldocs.XMLCorpusView
nltk.corpus.reader.wordnet._lcs_by_depth is removed. See #422.
Merge pull request #423 from kmike/remove_lcs_by_depth

remove nltk.corpus.reader.wordnet._lcs_by_depth