Django-filer-mod

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* Fixes template file permissions (packaging issue).

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* File.name move to not null (run migrations).
* Fix popup mode when Folder doesn't exists.
* 271 Remove unused templatetag from django 1.4.
* 269 Hide "Folder permissions" entry for "normal" users.
* 265 click on image thumbnail in popup looses context.
* 264 cancel search button looses popup context.
* 263 deleting images from the image detail view redirects to the wrong list view.

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* Removed nginx X-Accel-Redirect Content-Type header (245).
* Validate_related_name method appears to break in FilerFileField (148).
* Remember last openened folder in file picker (187).

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* Django-1.4 compatibility.
* Separate, customizable file storage backends for public and private files.
* Deleting a file in filer now deletes the file and all its thumbnails from the filesystem.
* Many bulk operations (admin actions).
* Backwards incompatible changes:
* storage refactor: path to private files in the db has changed (no longer relative to MEDIA_ROOT)
* `filer.server.urls` needs to be included to serve private files
* static media has been moved from 'media' to 'static'
(as proposed by django.contrib.staticfiles and django 1.3)
* django 1.2 no longer supported

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* Minor maintenance release.
* No longer unpack uploaded zip files (172).
* Removed some print statements.

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* Renamed media to static.
* New dependency: django-staticfiles or django >= 1.3.
* Minor bugfixes.