Django-boilerplate

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- Add: `ModelImageThumbs` Python 3 support.
- Add: `six` requirements.txt

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- Add: `ExtraFormsAndFormsetsMixin` trasactions are atomic now, if something fails nothings gets saved.

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- Fix: `ExtraFormsAndFormsetsMixin` parent response prevail.

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- Rename: `permissions.py` to `signals.py`
- Add: Documentation `add_view_permissions`
- Add: More tests

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- Remove: `templates` folder, `forms.py` and `views.py` no longer required, no longer required, Django cover this.
- Add: Initial tests
- Update: PEP8
- Bug: `add_view_permissions` Python3 compatibility
- Add: Allow email testing
- Enhancement: Rename variables `formsets` to `formset_list` and `extra_forms` to `extra_form_list`

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- Fix: If doesn't found model name get form name