Merge pull request #3 from nltk/master

Merge updates from NLTK master
Sort output of all wordnet methods with undefined order. This makes wordnet tests pass for all pythons.
don't run an example as a doctest in nltk.featstruct.py: this example relies on dict ordering, and this is already tested in featstuct.doctest
added reader for udhr2 corpus, resolves issue 84
SemcorCorpusReader was returning incomplete sense information

semcor.py was creating lemma sense tags as strings of the form `<lemma>.<sensenum>`, which is incorrect: the sense number is actually POS-specific. With this fix, SemcorCorpusReader tries to retrieve the Lemma object directly from WordNet (using the sense key). If that fails, a string of the form `<lemma>.<pos>.<sensenum>` is given.
pass wordnet corpus reader to semcor corpus reader
Merge pull request #1 from nschneid/patch-11

pass wordnet corpus reader to semcor corpus reader
corpus.doctest: update for semcor
Merge pull request #2 from nschneid/patch-11

corpus.doctest: update for semcor
Merge pull request #495 from kmike/wordnet-stable-ordering

Sort output of all wordnet methods with undefined order.
except Exception
Added partial support for mapping of tagsets.
Currently only works for the Universal Tagset (Petrov, Das, McDonald, 2012).
Existing support for a simplified tagset (via simplify_tags=True) is dropped.
Access new mappings via tagset='universal', optional flag for corpus reader
methods that return pos-tagged text.

https://github.com/nltk/nltk/issues/483
download any new corpora before running tests
Merge pull request #499 from stevenbird/master

Added partial support for mapping of tagsets.
changed tree node property to a method, and added a set_node method (following the model of prob/set_prob etc in probability.py)
fix the node setter in ImmutableTree
jenkins was configured to pull source form an nltk fork instead of the original repository
Merge pull request #503 from hleeldc/jenkins

Updated Jenkins job config file to get source code from original NLTK repository
Merge branch 'master' of https://github.com/stevenbird/nltk
Merge branch 'master' of https://github.com/nltk/nltk