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* Renamed build_media and resolve_media management commands to build_static
and resolve_media to avoid confusions between Django's use of the term
"media" (for uploads) and "static" files.
* Rework most of the internal logic, abstracting the core functionality away
from the management commands.
* Use file system storage backend by default, ability to override it with
custom storage backend
* Removed --interactive option to streamline static file resolving.
* Added extensive tests
* Uses standard logging