Merged changes from franckinux

Bugfixes in LatLon.eq (thanks to Lukas Vacek) and LatLon.angle
Merged changes from @franckinux and bumped up version to 1.3.1

Waypoint description support

1.3.0

Added support for waypoint descriptions in KML / GPX

1.2.1: Read KML files with only Folders defined if Document tag is lacking

The Document tag in KML files is optional

1.2.0

Update README.md