Python-tcxparser

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* Add coverage, flake8
* Support Python 3
* Move code into its own package
* Add some cycling support (16)
* Run tests on CI using tox-travis

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* Don't fail if lat/lon not present.

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* Fix for tracks with only 1 trackpoint.

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* Added average altitude support. Thanks firefly-cpp

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* Added heart rate data & pace support. Thanks stevedoyle

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* Changed methods to properties