Use prefixed class names
Further prefixing
Merge branch 'master' of https://github.com/opfo/app
Rename Post to Question
Add Post superclass and start splitting into models
Make OPFModel a protocol
Add further attrs to posts and questions
Merge branch 'master' of https://github.com/opfo/app

Conflicts:
	Code Stream.xcodeproj/project.pbxproj