------------------
* Substantial UI/UX overhaul.
* Fixes some Django 1.9 issues.
* Drop support for Django older than v1.5.
* Fixes urls for changed files.
* Fixes an issue with KeyErrors during saving folder.
* Provides support for configuring the canonical URLs.
* Remove `FILER_STATICMEDIA_PREFIX` and use `staticfiles` for static files.
* Fixes searching for folders.
* Adds checkerboard-tile backgrounds to illustrate transparency in thumbnails.
* Other fixes.