Fix comment typo
Add Fisher's exact test
do multi-word windows in the style of Church and Hanks (1990)
oops
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
Merge pull request #420 from Siddhant/patch-1

[nltk/tokenize/punkt.py] fix typo: taret -> target
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
Merge pull request #415 from dougalg/master

Proposed resolution for issue 395
Merge pull request #421 from michelleful/master

Added checking for zero depth in lch_similarity
Merge pull request #414 from rmalouf/colloc2

Small improvements to the collocation finders