Django-filer-mod

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* Fixes tests and configuration to run under Django 1.9
* Allow Django 1.9.x in setup requirements
* Fixes an issue where only the first drop-zone will be active
* Fixes an issue with Python 3 for the import_files command
* Fixes button space on delete confirmation modal
* Updates Filer image plugin form fields
* Removes folder content space in admin, side frame and modal
* Updates drag and drop modal window
* Updates drag and drop widget styles
* Fixes empty folder alignment

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* Allow to provide single dimension for resizing images.
* Search result fixes for current folder search.
* Workaround for SQLite problems on simultaneous file uploads.
* Add missing search results counters.
* Move project to divio/django-filer.
* Adapt documentation links.
* Cleanup frontend code and adapt to guidelines.
* Added drag & drop capabilities.
* Redesign of the User Interface

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* Fix imports for django-polymorphic>=0.8.
* Limit dependencies versions in setup.py.
* Simplify tox setup.
* Refactor Travis setup to use tox environments list.

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* Pin django-polymorphic version.
* Use specific django-mptt versions in tox.ini for different Django versions.

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* Repackage for PyPI.

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* Fixes a bad static path.
* Adds a fix for Django 1.8 envs.