Tablets

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- Adds mptt, removes "TemplateBlock" model


0.4.6 (2015/12/08)
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- Various DB-vs-filesystem customizations moved to run-time code instead of top of level Django settings

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- Fixes Jinaj2 rendering bug

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- Adds initial migrations

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- Adds `django-ace` to the admin

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- Removes gnarly `print`

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- Adds Jinja2 support