What is the suggested way to deal with this? Call `sync_entities` after any bulk creation of models that inherit from `EntityModelMixin`?

If that's how it should be done, could `EntityModelMixin` override `bulk_create` with something like:

```python
def bulk_update(self, *args, **kwargs):
    super(EntitiyModelMixin, self).bulk_update(self, *args, **kwargs)
    sync_entities()
```

Or does that introduce too much weirdness? It would work, but would require classes to be defined as:

```
class Account(EntityModelMixin, models.Model):
```
instead of 
```
class Account(EntityModelMixin, models.Model):
```