Fixes and enhancements
* Fix syntax error in `multimedia.exif.lens` at line 22
* Prevent `AppRegistryNotReady` when importing `django.models.utils`
* Add `{pre,post}_func` arguments to `filesystem.from_template`
* Function `filesystem.from_template`: Make destination optional + allow to set template to content
Features
* Add function `crypto.get_password_generator`