* Added custom schemaLocation support <https://github.com/tkrajina/gpxpy/pull/141>
* Division by zero in gpxinfo
* Missing tag(s) during parsing <https://github.com/tkrajina/gpxpy/issues/135>
* to_xml() fails with an empty extension element <https://github.com/tkrajina/gpxpy/issues/140>
* Setup.py: update classifiers, add python_requires and long_description <https://github.com/tkrajina/gpxpy/pull/142>