Collective.volto.subsites

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- Nothing changed yet.

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- Added Spanish translations.
[macagua]

- Add plone.app.caching >= 3.0.0a1 dependency to make it work in Plone 5.2
[erral]

- Enable versioning.
[cekk]

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- p.a.caching rules for rest api services.
[cekk]

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- Add kitconcept.seo behaviour.
[daniele]

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- Add subsite_logo field.
[cekk]

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- Enable subsites to be translatables.
[cekk]