- Remove outdated %clean section, no CFLAGS for noarch package

- Temporarily disabled tests due to false failures. Should be re-enabled in
5.1.1
- Update to 5.1:
* 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)