Fix collocations.doctest. See #399
more precise docstrings for FreqDist.keys, FreqDist.values and FreqDist.samples. Fixes #390.
Remove conditional imports from nltk.classify.__init__. This fixes #368.
Remove conditional imports in nltk.tag and nltk.tokenize. See #368.
Merge pull request #412 from kmike/no-conditional-imports

Remove unnecessary conditional imports
Merge pull request #409 from dougalg/master

Added java.exe as alternate binary name for Java
Some issues with childes corpus reader are fixed. Thanks @pfeyz. See #411.