Piccolo-admin

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* Exposed the ``host`` and ``port`` options directly in the sandbox CLI.
* Fixing a bug with read only mode. Was raising a 500 with disallowed HTTPS
methods

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* The foreign key selector in the sidebar is now search based, rather than a
select element, courtesy of sinisaos. This makes the admin work better with
very large data sets.
* Fixed a bug with nullable foreign keys. The value can now be set to null
without a validation error.

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Added an ``--inflate`` option to the CLI in example.py. This allows lots of
dummy data to be added during development.

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Fixing a bug with the date time picker on mobile devices - thanks sinisaos!

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Fixing a bug where clearing the filters wasn't clearing the duration widget's
value, as it uses a hidden input - thanks sinisaos!

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Added missing trailing slash to table detail endpoints.

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