Plone.app.theming

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* Patch App.Management.Navigation to disable theming of ZMI pages.
[elro]

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* Evaluate theme parameters regardless of whether there is a valid context or
not (e.g. when templating a 404 page).
[lentinj]

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* Moved the *views* and *overrides* plugins out into a separate package
``plone.app.themingplugins``. If you want to use those features, you need
to install that package in your buildout. Themes attempting to register
views or overrides in environments where ``plone.app.themingplugins`` is not
installed will install, but views and overrides will not take effect.
[optilude]

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* Support for setting arbitrary Doctypes.
[elro]

* Upgrade step to update plone.app.registry configuration.
[elro]

* Fixed plugin initialization when applying a theme.
[maurits]

* Query the resource directory using the 'currentTheme' name instead
of the Theme object (updating the control panel was broken).
[maurits]

* Fix zip import (plugin initialization was broken.)
[elro]

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* Make sure the control panel is never themed, by setting the X-Theme-Disabled
response header.
[optilude]

* Add support for registering new views from Zope Page Templates and
overriding existing templates. See README for more details.
[optilude]

------------------

* Add support for ``X-Theme-Disabled`` response header.
[elro]

* Make "Replace existing theme" checkbox default to off.
[elro]

* Fix control panel to correctly display a newly uploaded theme.
[elro]

* Fix zip import to work correctly when no manifest is supplied.
[elro]