Log Message:
Update to 5.1. From the changelog:

* Extensive, extensive unit test refactoring
* Convert the Docbook documentation to ReST
* Include the documentation in the source distribution
* Consolidate the disparate README files into one
* Support Jython somewhat (almost all unit tests pass)
* Support Python 3.2
* Fix Python 3 issues exposed by improved unit tests
* Fix international domain name issues exposed by improved unit tests
* Issue 148 (loose parser doesn't always return unicode strings)
* Issue 204 (FeedParserDict behavior should not be controlled by `assert`)
* Issue 247 (mssql date parser uses hardcoded tokyo timezone)
* Issue 249 (KeyboardInterrupt and SystemExit exceptions being caught)
* Issue 250 (`updated` can be a 9-tuple or a string, depending on context)
* Issue 252 (running setup.py in Python 3 fails due to missing sgmllib)
* Issue 253 (document that text/plain content isn't sanitized)
* Issue 260 (Python 3 doesn't decompress gzip'ed or deflate'd content)
* Issue 261 (popping from empty tag list)
* Issue 262 (docs are missing from distribution files)
* Issue 264 (vcard parser crashes on non-ascii characters)
* Issue 265 (http header comparisons are case sensitive)
* Issue 271 (monkey-patching sgmllib breaks other libraries)
* Issue 272 (can't pass bytes or str to `parse()` in Python 3)
* Issue 275 (`_parse_date()` doesn't catch OverflowError)
* Issue 276 (mutable types used as default values in `parse()`)
* Issue 277 (`python3 setup.py install` fails)
* Issue 281 (`_parse_date()` doesn't catch ValueError)
* Issue 282 (`_parse_date()` crashes when passed `None`)
* Issue 285 (crash on empty xmlns attribute)
* Issue 286 ('apos' character entity not handled properly)
* Issue 289 (add an option to disable microformat parsing)
* Issue 290 (Blogger's invalid img tags are unparseable)
* Issue 292 (atom id element not explicitly supported)
* Issue 294 ('categories' key exists but raises KeyError)
* Issue 297 (unresolvable external doctype causes crash)
* Issue 298 (nested nodes clobber actual values)
* Issue 300 (performance improvements)
* Issue 303 (unicode characters cause crash during relative uri resolution)
* Remove "Hot RSS" support since the format doesn't actually exist
* Remove the old feedparser.org website files from the source
* Remove the feedparser command line interface
* Remove the Zope interoperability hack
* Remove extraneous whitespace