[WIP] Sync field with Ralph Assets
[WIP] Small fix for tests (different ralph_device_id).
Merge branch 'synergy' of github.com:allegro/ralph_assets into feature/double-save-fields
Add tests for SyncedMixin in Assets
Flake8 fix
Merge branch 'synergy' of github.com:allegro/ralph_assets into feature/double-save-fields
Change implementation synced obj and fields
Merge pull request #381 from quamilek/feature/double-save-fields

Feature/double save fields