Explicitly mention setuptools 0.6 in install.rst

Setuptools merged with Distribute in 0.7. I think setup.py needs to be migrated to 0.7?
Merge pull request #1 from nltk/master

Updating
Merge pull request #429 from jskda/master

nltk fixes
Merge pull request #430 from jskda/master

PY3 fixed xml decoding detection bug
PY3: fix nltk.classify.tadm
rename compat._im_class to compat.get_im_class because it is not private
Lowest Common Hypernyms Change & Tests

- Set lowest_common_hypernyms to use max_depth by default
- Updated wup_similarity() to use min_depth with LCH
- Added a tests file for wordnet (only tests lowest_common_hypernyms()
at the moment)
- Added an additional LCH example to demo() which illustrates a case
where a target synset is also the LCH for itself and another synset
use nltk_data or nltk_data_3 as the directory name for data files depending on the current python version
use http://nltk.github.com/nltk_data/ or http://nltk.github.com/nltk_data_3/ as the download url depending on the current python version
reuse code from nltk.data to get the default download path, if no existing nltk data directories are present
open gzip files in text mode in the tadm classifier trainer
doctest and docstring updates
improve word_tokenize speed

Runs roughly twice as fast on my test set of 40000 sentences. According
to kernprof (http://pythonhosted.org/line_profiler/), the culprits of the
previously bad performance were

    r"([^' ])('ll|'re|'ve|n't|) "

and

    r"([^' ])('LL|'RE|'VE|N'T|) "

which were matching all words due to the | at the end.

Also removed some useless whitespace handling that was being undone by the
str.split just before return.

The contractions handling is now the slowest part @~20% of the time.
Merge pull request #434 from larsmans/faster-word_tokenize

improve word_tokenize speed
removed stale test framework
Merge pull request #432 from dougalg/master

Changes to wordnet lowest_common_hypernyms
encoding option for doctest files in runtests.py
Merge pull request #425 from pfeyz/patch-1

Explicitly mention setuptools 0.6 in install.rst
open gzip files in text mode in the tadm classifier trainer
Merge branch 'master' of https://github.com/nltk/nltk
Merge pull request #436 from jskda/pull_requests

open gzip files in text mode in the tadm classifier trainer
fixed failing doctests, caused by floating point precision issue