Unable to provide deferred types

[tonthon]

Providing custom deferred types results in an error

TypeError: __call__() takes exactly 3 arguments (1 given)

The column

class MyModel(DbBase):
    name = sa.Column(sa.Float(), info={'colanderalchemy': {'typ': deferred_type}})

The deferred type

@colander.deferred
def deferred_type(node, kw):
    if kw['use_float'] == True:
          return colander.Float()
    else:
          return colander.Integer()

When generating the schema with SQLAlchemySchemaNode, we get the error.

The error comes from the fact that a colander.deferred has a 'call' method.

https://github.com/stefanofontanelli/ColanderAlchemy/blob/master/colanderalchemy/schema.py#L286
An exception should be added for colander.deferreds.