Abstract out core functionality of DataContext and DataView models
This enables subclassing these core models for other users
Remove trailing comma when setting the field name
This cause the field name to be represented as a tuple
2.0.6 Release
2.0.7 Bump
Add history API settings and management command
Close #41
Update README with history documentation
Update modeltree version, make South a required dependency
2.0.7 Release
2.0.8 Bump
Add DataConcept.sortable field
This flag denotes if the fields in a concept should are appropriate
for performing an ORDER BY on a query. The restriction of usage
is not enforced when parsing DataView objects.
2.0.8 Release
2.0.9 Bump
Add content_type and update missing file_extensions on export classes
Update JSONGeneratorEncoder to subclass DjangoJSONEncoder
This handles Decimals and datetimes
Add `validate` classmethod, rename `node` to `parse`

The `validate` method is a convenience method for accessing
avocado.query.parsers.dataFOO.validate. The `node` method has been
renamed to match the same module method. In addition, the term 'node'
is quite opaque.
Add non-SQL for preventing redundant rows during export
Fix #43
Add support for 'key' simple types
Refactor R and SAS exporters to be template-based
Fix DataField lookup to use get_by_natural_key
This ensures natural key formats can be used
2.0.9 Release