Piccolo-admin

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* Bumped Node dependencies with security warnings.
* Slightly changed light mode styles (blue-grey sidebar instead of grey).
* Fixed the `admin_demo` command which is installed by setup.py - the path was
wrong.

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Modified the UI to support columns with a ``choices`` attribute set. A select
input element is shown.

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Fixed issue with ``BigInt`` values being displayed incorrectly.

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Added support for ``Array`` column type.

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Exposing the site name on the login page, courtesy of sinisaos.

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Added tooltips using the ``help_text`` attribute on ``Table``.

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