* Adding support for GPX 1.0 as well as 1.1 (since libxml namespace parsing
was hard-coded to 1.1. previously).
* Adding a GPX 1.0 unit test file.
* Miscellaneous updates to make it work with Ruby 1.8.6.
possible on the bounds element.
Formerly, a bounds element with a minlat or minLat attribute (instead of
min_lat) would not be properly parsed. Now all three styles of attribute name
are accepted.