Stick to AccessControl directly for checking buyable controls permissions. <SpecialUser 'Anonymous User'> instance returned by plone.api.user.get_current() not provides checkPermission function, which makes it useless.
disable theming conditionally for BuyableControls
Merge pull request #23 from TheVirtualLtd/master

disable theming conditionally for BuyableControls + update registry.xml tax rate
merge with master