Flask-restalchemy

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**Fixed:**

* Fix license placement on setup.py

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**Added:**

* Added api decorator 'route' to register a url rule

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**Changed:**

* Removed flask-restful dependency

**Added:**

* Added support for request decorators
* Added new field NestedModelListField
* Added support for free functions rules
* Added a way to specify the http methods available on an endpoint

**Fixed:**

* Fix bug that was removing target objects when undoing a relationship
* Fix bug that was causing the session not be passed to the serializers

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**Changed:**

Change the way Column Serializers are registered: by using Api class method
`register_column_serializer` (instead of ModelSerializer.DEFAULT_SERIALIZER class attribute).

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**Fixed:**

When adding the same property twice with different url an error occurred due to the endpoint provided to the RESTFul be
the same. Now add_property have an optional parameter 'endpoint_name' to enable specify a different endpoint and
defaults to the provided 'url_rule'