Django-sharding

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Small fix of legacy settings name

- `DJANGO_FRAGMENTS_SHARD_SETTINGS` to `DJANGO_SHARDING_SETTINGS`.

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Small Fix for people wrapping the package

- Allow you to rename the app the config is loaded in through a hiddden setting

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Small Fix

- Stop selecting incorrect shard group.

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More Tests and Docs

- Added additional tests and updated docs

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New Package

- Added initial functionality to support sharded models, read replicas, tables on non-default databases, docs etc...