Newsletter

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* make newsletterapp more extensible.

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* clean so it works in modern packaging tools.

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* newsletterapp bug fix related to contact form functionality.

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* Adding a pypackages directory for newsletterapp for extending newsletterapp.

* port listened on respects config file setting.

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* doc error fix

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* newsletterapp more secure by default. Does not setup default users for admin section.
* fixed some test failures.
* removed single new line at end of template files, that is put there by editors like vim.

* newsletterapp can be used for contact forms through send_message config items in the config file.