Piccolo

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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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Added support for filtering ``Array`` columns.

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Add the ``Array`` column type as a top level import in ``piccolo.columns``.

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* Refactored ``forwards`` and ``backwards`` commands for migrations, to make
them easier to run programatically.
* Added a simple ``Array`` column type.
* ``table_finder`` now works if just a string is passed in, instead of having
to pass in an array of strings.

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Catching database connection exceptions when starting the default ASGI app
created with ``piccolo asgi new`` - these errors exist if the Postgres
database hasn't been created yet.

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