Plone-formwidget-contenttree

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* Add in some default binder instances, mostly for use with supermodel XML
schemas.
[lentinj]

* Switch to ``plone.app.testing``
[saily]

* Add js and css registration tests
[saily]

* Added check in tree generation if it allready exists (reopening the contenttree window).
[phgross]

* Do not exclude content types which are not allowed in navigation [ebrehault]

* Ignore missing values, content objects can go away or the content of a source may change.
[gaudenz]

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* Tweak CSS to use outline instead of border.
[elro]

* Avoid theming ajax response.
[elro]

* Ensure context is a content item of some sort.
[elro]

* Import getSite from zope.component to avoid dependency on zope.app.component.
[hvelarde]

* Import ViewPageTemplateFile from zope.browserpage to avoid dependency on
zope.app.pagetemplate.
[hvelarde]

* Added french translation.
[phgross]

* Trigger change handler when used with datagrid
[kingel]

* Use an ajax fetch for the initial call
[kingel]

* Fix url in display templates, so that it uses absolute urls.
[phgross]

* pep8
[joka]

* Fix term title genration to use the brain id if there is not brain title
[joka]

* Added Italian translation.
[gborelli]

* Added Finnish (fi) translation.
[dokai]

* By default filter out nodes that are not selectable and not folderish.
This can be overridden on the widget by setting show_all_nodes to True.
[maurits]

* Added Dutch translation.
[maurits]

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* Added Spanish translation
[hvelarde]

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* fix _getBrainByValue to check if value is traversable
first so we can provide the correct token.
[vangheem]

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* Add zh_CN translation.
[jianaijun]

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* Fix regression that broke the browsing with JQuery < 1.4.
[davisagli]