Mapentity

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**Bug fixes**

- Fix GenericRelation

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**Bug fixes**

- Fix AutoLogin middleware with django 1.8

**Internal changes**

- Prepare code to compatibility python2 / python3
- Use GenericRelation for Paperclip, to permit prefetch_related on them
- Upgrade requirements

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**New features**

- new django-paperclip version, with external picture URLs

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**Bug fixes**

- fix distribution version

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**Bug fixes**

- GPX linestring export in track format, instead of route

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**Breaking change**

- Require Django 1.8
- Upgrade several dependencies with some API changes