Paperclip

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** Fixes **

* Fix releases required includes

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** New **

* From now, Attachment model support external picture URLs

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** BREAKING CHANGES **

* Provide an abstract model. Users are required to define their own
Attachment model

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** BREAKING CHANGES **

* Remove support of Django <= 1.7
* Rename parameter 'module_name' as 'model_name' in urls

** New **

* Support Django 1.8
* Add initial migration (Caution! it depends on app settings)

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** New **

* Add a command to clean obsolete files

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** Fixes **

* Fix uploaded file modification