Apparently, _setparent is called in .parse() – dropping it from AbstractParentedTree. (fixes #229 in NLTK)
refactor and slightly optimize metrics.scores
Merge commit '8eeac2779b13b339ef8318878ad02d3b445f2fbf'
Use the izip import
cosmetics: get rid of CVS-style $Id$ lines

The CVS-style $Id$ lines are pretty much useless with git; and
anyway, using them would require adding proper "ident" directives
to the .gitattributes file -- and we don't have such directives.
Merge pull request #234 from slattarini/cvs-style-id-lines-removed

cosmetics: get rid of CVS-style $Id$ lines
Add link to GitHub page
Merge branch 'master' of github.com:nltk/nltk
deleted stale Mac files
deleted stale Mac files
fixes by Alexis Dimitriadis
cosmetics: get rid of even more CVS-style $Id$ lines

The CVS-style $Id$ lines are pretty much useless with git; and
anyway, using them would require adding proper "ident" directives
to the .gitattributes file -- and we don't have such directives.

This change removes some occurrences of $Id$ lines that have been
missed by yesterday's commit 44745e29.
Merge pull request #236 from slattarini/cvs-style-id-lines-removed

cosmetics: get rid of even more CVS-style $Id$ lines
prefer NotImplementedError over AssertionError in few places

The python documentation on "Built-in Exceptions":

  <http://docs.python.org/library/exceptions.html>

reads:

  ``In user defined base classes, abstract methods should raise
    this exception when they require derived classes to override
    the method.''

But existing NLTK code didn't consistently follow that best practice,
sometimes using 'AssertionError' or 'assert' in similar situations.
Fix that.  Also, make error messages less verbose, for consistency
with other existing code.
Merge pull request #237 from slattarini/better-exceptions

prefer NotImplementedError over AssertionError in few places
Replace comments' load_ic() with nltk.corpus.wordnet_ic.ic()
Merge pull request #240 from jnothman/master

Replace old comments' references to load_ic()
Added flag to ignore case when building dispersion_plot. This will require an update to the functions consuming dispersion_plot.
expanded the .gitignore file
Merge pull request #242 from larsmans/expanded-gitignore

expanded the .gitignore file