Plone-formwidget-querystring

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- Conditionally setup zope.app.form field.
[vangheem]

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- Fix criteria checkbox rendering if value contains non ASCII characters.
[rnixx]

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- Fixed sort index selection which was not preserved when editing collection
criteria.
[naro]

- make compatible with jQuery >= 1.9
[petschki]

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- Fixed label for "Add Criteria" (missing id="addindex")
[djay]

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- Avoid `TypeError: 'NoneType' object is not iterable` when the query
of the collection is still `None`, like is the case when adding one.
[maurits]

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- Change javascript to work on ``form-widgets-ICollection`` fields instead of
``form-widgets``.
[maurits, kaselis]