Piccolo-api

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If ``BaseUser`` is used with ``PiccoloCRUD``, passwords are handled properly.
Thanks to sinisaos for making this change.

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``PiccoloCRUD`` now handles database exceptions better. If a query fails due to
a unique constraint, a 422 response code is returned, along with information
about the error.

This means Piccolo Admin will show more useful debugging information when a
query fails.

Thanks to ethagnawl for reporting this issue, and sinisaos for help
prototyping a solution.

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Fixed a bug with ``Email`` columns and ``PiccoloCRUD.get_new``. Thanks to
Tar8117 for reporting this bug.

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Previously you had to provide ``folder_name`` as an argument to
``S3MediaStorage``.

It's now optional, as some users may choose to store their files in a bucket
without a folder.

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When uploading files to S3, we try and correctly set the content type. This now
works correctly for ``.jpg`` files (previously only ``.jpeg`` worked for JPEGs
). Thanks to sumitsharansatsangi for adding this.

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Fixed a bug with ``MediaStorage.delete_unused_files`` - it was raising an
exception when used with ``Array`` columns. Thanks to sumitsharansatsangi for
reporting this issue.

When using ``S3MediaStorage`` you can now specify additional arguments when
files are uploaded (using the ``upload_metadata`` argument), for example,
setting the cache settings, and much more. Thanks to sumitsharansatsangi, and
sinisaos for help reviewing.

.. code-block:: python

S3MediaStorage(
...,
Cache the file for 24 hours:
upload_metadata={'CacheControl': 'max-age=86400'}
)

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