Plone.app.querystring

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Bug fixes:

- Fix query_index_modifiers and tests with py3
[pbauer, gforcada]

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Bug fixes:

- Fix a case, where objects id starts with roots id
[eikichi18]

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Bug fixes:

- Ignore unknown ``sort_on`` indexes when parsing a query.
Otherwise you get a ``CatalogError``. [maurits]

- Add Python 2 / 3 compatibility
[pbauer]

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Bug fixes:

- Fix tests with CMF 2.3. [davisagli]

- Fix querybuilder if SearchableText is a dict {'query': '...'}
[tomgross]

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Bug fixes:

- Filter query string from bad term and operator.
[nngu6036]

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Bug fixes:

- remove unittest2 dependency
[kakshay21]