Skip nltk.wsd docktest because lesk() return value is nondeterministic.
wsd.doctest: skip lesk() test.
Merge branch 'develop' into wsd-tests
nltk.wds.lesk() is deterministic now.

There is no need for the dictionary lesk() argument to be a dictionary.
Now, it’s an iterable of sorted items.
Merge with development
Refactoring of wsd.lesk().
Whitespaces
Merge pull request #765 from dimazest/wsd-tests

Make nltk.wsd.lesk() deterministic.