Collective-editskinswitcher

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- Slightly better check for anonymous users, using getSecurityManager
instead of checking for an ``__ac`` cookie.
[maurits]

- When a X_FORCE_LOGIN header is passed (exact spelling is configurable)
only allow access to logged in users (you get redirected usually).
[maurits]

- Allow specifying the admin_header; defaults to HTTP_PLONEADMIN.
[maurits]

- Added z3c.autoinclude.plugin entry point for plone, to avoid having
collective.editskinswitcher in the zcml option of your zope
instance; only effective in Plone 3.3 or higher. In earlier
versions you still need to do this manually.
[maurits]

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- Added switching option based on a request header flag set by the
proxy server (eg. Apache)
[Ed Crewe, ILRT - University of Bristol]

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- New preview feature so that the default skin can be seen via the
edit skin interface to preserve some level of WYSIWYG for editing.
(Based on part of an unreleased plone 2 product by Dominic Hiles.)
Preview feature is available as a viewlet for use via a view or a
viewletManager, but it is turned off by default. Examples of how to
enable it are included in the tests, where it is enabled and tested.
[Ed Crewe, ILRT - University of Bristol]

- Extra URL skin switching options of SSL or specific URLs
[Ed Crewe, ILRT - University of Bristol]

- Setting eol style in subversion correctly. [reinout]

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- Bug fix: when called on the zope root (can happen in some cases)
portal_properties was not found, which was not caught correctly.
[maurits]

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- Bug fix: if object has no changeSkin, try its context. Happens at
least on the sharing tab when searching for users, as object is a
KSS view then.
[maurits]

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- Instead of an Access Rule, use a pre-traversal hook. Idea: David
Convent. Thanks! Is a lot cleaner.
[maurits]

- Avoid confusion in README.txt: talk about Editor Skin and Visitor
Skin instead of Plone Default and the default skin.
[maurits]

- Update README.txt to tell about the new options introduced in
version 0.2.
[maurits]