Piccolo

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Added new UI for the foreign key selector.

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* Fixed a bug when multiple tables inherit from the same mixin (thanks to
brnosouza).
* Added a ``log_queries`` option to ``PostgresEngine``, which is useful during
debugging.
* Added the `inflection` library for converting ``Table`` class names to
database table names. Previously, a class called ``TableA`` would wrongly
have a table called ``table`` instead of ``table_a``.
* Fixed a bug with ``SerialisedBuiltin.__hash__`` not returning a number,
which could break migrations (thanks to sinisaos).

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Improved ``Array`` column serialisation - needed to fix auto migrations.

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Fixed a bug where resetting the filters in the sidebar would set them to
``less than``. Now they reset to ``equals``. Courtesy sinisaos.

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Fixed a bug where a filter for a column with choices would default to
``'Null'`` instead of ``'All'``.

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Added a ``visible_filters`` option to ``TableConfig``, allowing the user to
specify which filters are shown in the filter sidebar. This is useful if you
have a lot of columns. Courtesy sinisaos.

Improved the navigation sidebar UI - each section can now be hidden, and the
appearance has been improved when table names are very long. Courtesy
sinisaos.

Added docs for Javascript formatting to help new contributors.

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