FEATURE: Added ability to copy validations from the underlying model.
REFACTOR: Added describe blocks to test.
BUGFIX: Fixed tests for activemodel < 4
BUGFIX: Validates is now passed symbol arguments, for rails 3.0.
REFACTOR: Added a Mapping class as a higher level of abstraction of Representable::Config
REFACTOR: Changed inverse_map to inverse_image, and forward_map to forward_image.
REFACTOR: Simplified Mapping class
Support column_for_attribute in Forms that use Composition
require representable 2.0.3.
Merge branch 'with-model-validations' of https://github.com/cameron-martin/reform
use new representable API.
Merge branch 'feature/support_simple_form_type_mapping_with_composition' of https://github.com/karolsarnacki/reform