Comment 7 for bug 1056820

From the NEWS file, differences since 5.1:

5.1.2 - May 3, 2012
    * Minor changes to the documentation
    * Strip potentially dangerous ENTITY declarations in encoded feeds
    * feedparser will now try to continue parsing despite compression errors
    * Fix issue 321 a little more (the initial fix missed a code path)
    * Issue 337 (`_parse_date_rfc822()` returns None on single-digit days)
    * Issue 343 (add magnet links to the ACCEPTABLE_URI_SCHEMES)
    * Issue 344 (handle deflated data with no headers nor checksums)
    * Issue 347 (support `itunes:image` elements with a `url` attribute)

5.1.1 - March 20, 2011
    * Fix mistakes, typos, and bugs in the unit test code
    * Fix crash in Python 2.4 and 2.5 if the feed has a UTF_32 byte order mark
    * Replace the RFC822 date parser for more extensibility
    * Issue 304 (handle RFC822 dates with timezones like GMT+00:00)
    * Issue 309 (itunes:keywords should be split by commas, not whitespace)
    * Issue 310 (pubDate should map to `published`, not `updated`)
    * Issue 313 (include the compression test files in MANIFEST.in)
    * Issue 314 (far-flung RFC822 dates don't throw OverflowError on x64)
    * Issue 315 (HTTP server for unit tests runs on 0.0.0.0)
    * Issue 321 (malformed URIs can cause ValueError to be thrown)
    * Issue 322 (HTTP redirect to HTTP 304 causes SAXParseException)
    * Issue 323 (installing chardet causes 11 unit test failures)
    * Issue 325 (map `description_detail` to `summary_detail`)
    * Issue 326 (Unicode filename causes UnicodeEncodeError if locale is ASCII)
    * Issue 327 (handle RFC822 dates with extraneous commas)
    * Issue 328 (temporarily map `updated` to `published` due to issue 310)
    * Issue 329 (escape backslashes in Windows path in docs/introduction.rst)
    * Issue 331 (don't escape backslashes that are in raw strings in the docs)