Fix bug where correct() stripped punctuation

See #48
On branch dev
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	modified:   HISTORY.rst
	modified:   tests/test_blob.py
	modified:   textblob/__init__.py
	modified:   textblob/blob.py
Fix failing test
On branch dev
Your branch is up-to-date with 'origin/dev'.

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	modified:   tests/test_blob.py
Make TextBlob.words more efficient
Merge branch 'master' into dev
Use POST requests for translation and detection
Fix url and update HISTORY
Update pattern find_tags
Clean up tests and make them py26-compatible
Preserve whitespace after spelling correction
Merge pull request #51 from davidnk/dev

Preserve whitespace after spelling correction
Add @davidnk to AUTHORS and update CHANGELOG
Typo fixes
Try using sudo to download corpora
Nope. reverting travis.yml
Use S3 mirror for travis build
Minor travis.yml fix
Bump version 0.8.1 -> 0.8.2