py-django-import-export: updated to 1.0.1

1.0.1:
Make deep copy of fileds from class attr to instance attr
Fix: NumberWidget.is_empty() should strip the value if string type
Fix: last day isn't included in results qs
use Python3 compatible MySql driver in development
fix: warning U mode is deprecated in python 3
refactor: easier overridding widgets and default field
Updated documentation regardign declaring fields
custom js for action form also handles grappelli
Use 'verbose_name' in breadcrumbs to match Django default
Add Resource.get_diff_class()
Fix and add polish translation
Restore raise_errors to before_import

(adam)