Collective.dexteritytextindexer

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- Nothing changed yet.

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- Fixed duplicated values in SearchableText.
[gbastien]

- Fix a bug in the RichText field indexer on Python 3.
[alecpm]

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- Add behavior shortname "collective.dexteritytextindexer"
[agitator]

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- A few updates to make build pass on travis again, i.e.
add index/allow-hosts to buildout configs,
set version.cfg reference to 'latest' for 5.0.x,
bump setuptools and zc.buildout versions
[staeff]

- Update the Add-On to also run in Plone 5.2 with Python 3.
Fixes https://github.com/collective/collective.dexteritytextindexer/issues/31
[staeff]

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- Fix a bug in the RichText field indexer when the value of RichText field is None.
The bug was introduced in 2.2.0.
[mbaechtold]

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- Added TupleFieldConverter, to enable indexing of portal catalog KeywordIndex indices.
[jone, mtrebron, maurits]

- Improved code quality. [maurits]

- Add the ability to index a RichText field. Fixes 23.
[smcmahon]