Scaffold the topics
Add has_many association to groups
Render topics index in groups show page
Change .gitignore file
Add hidden_field for group_id
render template for topics form in groups
Fix belongs to relationship
Fix path for "back" link
Make form nicer
Make redirect go to group page
Add person_id to topics
Make sure person is automatically set when adding a topic
Remove unnecessary input field
Remove unnecessary fields/code
Redirect to group page upon create and update (removing the need for show)
Delete all auto-generated topic tests
Merge resolved for add topics courtesy of Tam and Susanne