Django-waffle-session

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- Fix waffle template functions when no request is present.
- Added testing mode to flags.
- Add WAFFLE_*_DEFAULT for switches and samples.

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- Fix issue with stale cache using bulk admin actions.

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- Fix waffle.js in Safari.

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- Handle 404s correctly.

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- I am bad at packaging.

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- Add 'note' field.
- Add migrations for Samples.
- Clean up Jinja2 functions.