Ftw-referencewidget

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- Implement display mode for the reference widget.
[mathias.leimgruber]

- Change name of sample content buildour registry entry to avoid conflicts.
[mathias.leimgruber]

- Implement path restriction option.
[mathias.leimgruber]

- Render hidden input elements for given references, instead of
render them only by Javascript. This way the widget behaves more
like all other plone widgets.
[mathias.leimgruber]

- Implement a additional `traversal_query` parameter for the widget.
[mathias.leimgruber]

- Implement ReferenceObjPathSource for IRelationChoice fields.
[mathias.leimgruber]

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- Implement some sort options.
[mathias.leimgruber]

- Use plone.app.redirector to follow renamed and moved content.
Also do not fail if the content has been removed.
[mathias.leimgruber]

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- Fix edge case (mainly for tests) if the value passed to the
IList/Widget converter is not a list, but a string.
[raphael-s]

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- Implement testbrowser widget.
[raphael-s]

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- Respect missing_value set by the field.
[tschanzt]

- Implement support for ITextLine only with ReferenceWidget.
[mathias.leimgruber]

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- Show absolute path starting at the plone root for the selected value.
[mathias.leimgruber]

- Remove the list style type and the obsolete spacing for the selected elements.
[mathias.leimgruber]

- Implement support for IList of IRelationChoice explicitly.
Check Readme for more informations
[mathias.leimgruber]