Super-basic implementation of Field class.
Merge branch 'develop' into feature/declarative-fields
Importing Field in django_tablib.__init__.py.
Using __all__ in django_tablib.__init__.py.
Made attribute a non-required arguement of Field.__init__().
Modifed DatasetMetaclass and ModelDataset to allow declarative fields.
Added test for declarative fields.
Settings headers properly with declarative fields.
Testing that headers are set properly with declarative fields.
Removed tests for old style stuff.
Test that declarative fields actually work.
Testing that we can explicitly set headers with declarative fields.
Added header to Field.__init__().
Properly setting headers for declarative fields.
More complete test for headers of declarative fields.
Don't set Field.header to the attribute if no header is specified.
Updated documentation to reflect functionality of new declarative fields.
Mirror tastypie functionality by introspecting fields and allowing declarative fields to override; allow fields and exclude lists to be specified in the meta.
Adjust test for new functionality.
Test that specifying fields and exclude in ModelDataset.Meta works.