Add readme
Add basic database structure
Add first user
Refactor user creation
Implement exercise iterations
Implement prolific character
Add another character
Add another character
Reduce duplication in rake task
Add another character
Add ruby team
Add empty team
Add team 'motley', various languages
Add big team
Refactor rake task
Add small team
Add multiple team invitations
Make bob interesting in terms of teams
Refactor user
Don't pass databases around