Fixed duplicated index name mentioned in #51.
Merge pull request #85 from nicholasamorim/index_name_fix

Fixed duplicated index name mentioned in #51.
Added support to fields and exclude when serializing to dict or json
Removed clutter and added parameters in the function docstring.
Added documentation on serialization with fields and exclude.
Merge pull request #87 from nicholasamorim/dict_format

Support to fields and exclude in serialization
when default_factory was defined in any model, mamba-admin sql create added a default value that shouldnt be there, this was reported in mamba-storm https://github.com/PyMamba/mamba-storm/issues/4