Basic Organic group setup

This screencast shows some basic usage of Organic groups:

• How to create a content type that is used as groups – meaning containers for other stuff (content and other entities)
• How to modify a content type (Articles) to allow it to be posted to selected groups
• That the user creating a group by default will be the group manager
• How to add more members to a group
• That there is an example feature shipped with OG
• That groupness and group contentness is actually managed by special fields
• That group membership is actually also managed with a field (of the same type that tells what group a content piece belogs to)