Collective-ckeditor

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- Add a setting for CKEditor skin: colored or flat buttons

Default skin remains Moonocolor, colored buttons.
Flat buttons comes from the new Moono-lisa skin (see http://ckeditor.com/addon/moono-lisa)
[gotcha]

To avoid ugly border-bottom on buttons in default Plone 4 skin: add the
following style to your CSS::

content a.cke_button {
border-bottom: 0;
}

content a.cke_button:hover {
border-bottom: ccc 0.1em solid;
}

- Update to CKEditor 4.6.2
[gotcha]

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- ``nonbreaking`` plugin: used to insert non breaking spaces and hyphens.
[gotcha]

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- Fix overloading settings: it should be empty dict rather than None
[gotcha]

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- Enable settings overloading for formlib wysiwyg widget
[gotcha]

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- Fix customization per widget of filexxxBrowserUrl, depending on language
[gotcha]

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- Enable settings overloading for plone.app.z3cform wysiwyg widget
[gotcha]

- Enable customization per widget of filexxxBrowserUrl, depending on language
[gotcha]