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.
Support for projected and geographic GML profiles of GeoRSS with tests.
Ensure appropriate coord swapping for GML posList.
Bind latlons.next to local variable nxt.
Use a syntax compatible with Python 2.4
Support the georss and gml namespaces

Fixes issue 62.
Thanks to Sean Gillies for providing the patches for this!