SKINSTXTRCOM-4163 : initial commit for the `barrel` module - the replacement for reaktor models and mappers.
SKINSTXTRCOM-4163 : adding BooleanField.
SKINSTXTRCOM-4163 : adding DateField.
SKINSTXTRCOM-4163 : adding IntegerField.
SKINSTXTRCOM-4163 : adding MoneyField.
SKINSTXTRCOM-4163 : Fix and clean barrel + add test for corrected bug.
SKINSTXTRCOM-4163 : Provide RpcMixin to tie reaktor and barrel.
SKINSTXTRCOM-4163 : set data in stores is now possible.
SKINSTXTRCOM-4163 : models drafts.
SKINSTXTRCOM-4163 : cleanup in models.
SKINSTXTRCOM-4163 : Improve documentation.
SKINSTXTRCOM-4163 : add __str__ method to Field class.
SKINSTXTRCOM-4163 : add polymorphic basket items support.
SKINSTXTRCOM-4163 : extend rpc to enable multiple call from a single method.
SKINSTXTRCOM-4163 : clean up in models.
SKINSTXTRCOM-4163 : MoneyField is not yet supported.
SKINSTXTRCOM-4163 : adding FloatField.
SKINSTXTRCOM-4163 : adding LongIntField.
SKINSTXTRCOM-4163 : `Store` class can be inherited properly now.
SKINSTXTRCOM-4163 : `MoneyField` is not used anymore. Adding Document model.