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* Added overrides.zcml for BBB http://plone.org/products/plone-seo/issues/19,
http://plone.org/products/plone-seo/issues/23 [mylan]
* Prevent view breakage for context, which canonical url can't be calculated for
http://plone.org/products/plone-seo/issues/22 [mylan]
* Fixed security issue for SEO Property action and view
http://plone.org/products/plone-seo/issues/24
[crchemist, mylan]