Django-jinja

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- Minor fix on extensions.

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- Add missing import on setup.py of views.

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- Add generic views helpers (thanks to sbutler).
- Minor fixes on imports.
- Add helper for set the "undefined" parameter in a easy way.
- Add a simple way to add extensions from apps.
- Fixed bug related to csrf_token.

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- Fix django 1.8 compatibilities.
- Fix documentation issues.
- Remove obsolete code.

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- Do not load django < 1.7 setup related settings for django 1.8 backend.
- Fix django-debug-toolbar compatibility.

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- Fix bug related to doble inclusion of DEFAULT_EXTENSIONS.
- Remove the extra django filters extension and document the change.