Django-filer-mod

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* Enabled django-mptt 0.9
* Converted QueryDict to dict before manipulating in admin
* Hide 'Save as new' button in file admin

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* Don't show set public / set private actions if permissions are disabled.

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* Allowed easy-thumbnails < 3 in setup.py
* Fixed broken reference for delete icon
* Fixed minor documentation issues
* Fixed travis configuration
* Fixed a regression with loading and dumping fixtures (965)
* Added callable instead of setting as Filer.is_public default
* Fixed canonical URL computation
* Fixed image preview target size
* Fixed translatable string
* Updated translations
* Changed file size field to BigIntegerField
* Fixed import_files command to work on Django 1.10+
* Used get_queryset in FolderAdmin instead of the manager
* Cleaned up swapped models implementation
* Allowed django-polymorphic>_2.0

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* Introduced Django 1.11 support
* Fixed `get_css_position` filter breaking when there is no image
* Fixed missing html title when adding folders
* Fixed a regression where third party app migrations would require the
``FILER_IMAGE_MODEL`` setting.

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* Added 'get_css_position' template filter for background images
* Updated translations

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* Fixed markup issue with editing file in admin
* Fixed error message not always showing up properly
* Added generate thumbnails management command
* Fixed dropzone styles on smaller widths
* Fixed dropzones in inlines not initializing in Django < 1.9
* Added an action button to the directory listings to download files
* Added support for Django 1.10
* Added title attribute to the file name
* Fixed an issue whereas the CSS was compiled incorrectly
* Fixed an issue where links failed to open from django CMS sideframe
* Fixes object tools placement on image detail page and removed background color and shadow
* Added edit button to image widget
* Removed arrow in breadcrumbs if no folder or name follows
* Fixed jQuery loading on file move/copy page with Django 1.9
* Fixed localization for fieldsets of ImageAdmin
* Fixed unquoting in files search