Data-importer

- bugfix django.get_version() using StrictVersion

- Fix suppport to django 1.3
- Fix suppport to django 1.4
- Fix suppport to django 1.5
- Add support to South Migrations and Django Migrations 1.7
- Fix support for GenericRelation with Django 1.3 x Django 1.9
- Fix support with FileWrapper for Django 1.3 to Django 1.9
- Update tests to use py.test
- Update tox
- Update Makefile and dev startup

- Upgrade generic view to django 1.9 version

- Task save only valid lines and send email with errors

- Add support to Django Customer User

- add self.file_history on BaseDataImporter