Use CAS for adding blobs.
Fix number of skipped tests when running pytest.
Use CAS for storing snapshot.
Use CAS for reading snapshot.
Remove function no longer in use.
Remove unused imports.
Started to implement FridgeCore.
Use fixture in TestFridgeCore.
Adjust pylintrc for pytest fixtures.
Implement writing/parsing snapshots in FridgeCore.
Implement reading of snapshots in FridgeCore.
Just use arbitrary keys in tests.
Implement setting and reading head in FridgeCore.
Refactor MemoryFS fixture out of tests.
Use MemoryFS fixture in fridge fixture.
Remove unused import.
Implement checkout_blob in FridgeCore.
Use FridgeCore in CLI script.