Merge pull request #1 from nltk/develop

Syncing forked version of NLTK - alvations
Fix to bug #681
new sentiwordnet corpus reader, by Christopher Potts
basic sentiwordnet functionality now working
added basic documentation for sentiwordnet
doctest fixes
fixed string syntax error from previous commit; dealing with cyclic import issue
add missing import for BNC corpus reader
doctest fixes; still problems for gluesemantics
updates for 3.0b1
extended version number
updates for NLTK 3
some demo fixes
fix to #699
doc test fixes
convert the resource names to paths in windows so data.doctest passes
Merge pull request #701 from jskda/pull_request.unittest_fixes

Fixes to data.doctest
Merge pull request #700 from jskda/pull_request.699

fix to #699
Merge pull request #2 from nltk/develop

Syncing fork with v3.0
Merge pull request #695 from helmanofer/patch-2

Fix to bug #681