Change ContentMembershipProvide to check the property RequiresUniqueEmail instead of the field during CreateUser
Merge pull request #415 from bussemac/master

Support RequiresUniqueEmail better
Removed incorrect 'abstract' qualifiers.
Merge branch 'master' of https://github.com/n2cms/n2cms
More comments and consolidated some code in MenuPart.
More doc comments.
Merge pull request #416 from jsassner/master

Add ISafeContentRender encoding to Add new item, position tab. Links to #362