ticket 335. implement more media: tags

* media:group (ignored, to get to the tags within)
* media:description (same as summary or description)
* media:credit (goes into media_credit)
* media:restriction (goes into media_restriction)
also support media:license
add parsing of a new date format (issue 373)
Add support for Podlove Simple Chapters (http://podlove.org/simple-chapters)
Add error handling when url isn't valid (issue 364)
Parse an entry's GeoRSS or GML elements.

Gives the entry object a GeoJSON-style "where" item. See
https://code.google.com/p/feedparser/issues/detail?id=62 for a history
of this work.
Add georss/gml tests and pass them.

Changing geometry type values to unicode strings passed the tests.
Geometry type values changed to unicode strings.
Don't crash if `chardet.detect()` returns `None`
Update SimpleChapter implementation to version 1.1
Remove `has_key()` references in the documentation

Fixes issue 367.
Thanks to Julian Berman for providing this patch!
Support the HTML5 attributes `poster` and `preload`

Fixes issue 356.
Thanks to Andy Wingo for providing the initial patch!
Don't strip inline FTP authentication credentials

Fixes issue 382.
Thanks to Google user bendriko for submitting the initial patch!
Prevent crash on hex charrefs with uppercase 'X'

Fixes issue 376.
Thanks to Google user chungwu for reporting this and providing a unit test!
Demonstrate issue 364
Catch ValueError in `isProbablyDownloadable()`

Fixes issue 364.
Thanks to Bernd Schlapsi for providing this patch!
Note that issue 364 is fixed
Support RFC822-ish dates with swapped days/months

Fixes issue 373.
Thanks to Bernd Schlapsi for providing this patch!
(Patch modified to move the unit test to the correct place and update the NEWS file.)
Bump version numbers to 5.1.3
Close unit test files after reading them

With this change, the unit tests run and all pass on PyPy 1.8.0!