Collective.searchandreplace

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- Added Russian translations. [serge73]

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- Added a behavior to add ISearchReplaceable on Dexterity content types.
Also added a profile to set this behavior on some content types.
[Gagaro]

- Only search and replace contents with the ISearchReplaceable interface.
[Gagaro]

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- Required ``plone.app.textfield`` in ``setup.py``.
[maurits]

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- Compatibility with Plone 5 and Dexterity content types.
[Gagaro]

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- Fix translation string of status message when replacing.
[maurits]

- Nicer message when immediately replacing all text without preview.
[maurits]

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- Add Travis badge.
[maurits]