Django-audiotracks

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- add "js-" prefix to classes used by JavaScript code
- upgrade to Django 1.9 and 1.10

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- Add Django 1.7 support
- Drop Django 1.5 support

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- Add tox and travis config files
- Add Python 3 support

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- make sure slug doesn't get too long
- skip tracks MediaElement.js cannot read
- exclude example_project from distribution

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- fix doc

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- integrate MediaElement.js audio player to default templates
- display file type and size in download button
- serve m3u playlist